Bio Chapter 27, 28, 31
35) Members of this phylum produce two kinds of haploid spores, one kind being asexually produced conidia: A) Zygomycota B) Ascomycota C) Basidiomycota D) Glomeromycota E) Chytridiomycota
Ascomycota
37) Members of this phylum form arbuscular mycorrhizae: A) Zygomycota B) Ascomycota C) Basidiomycota D) Glomeromycota E) Chytridiomycota
Glomeromycota
40) Which taxon of eukaryotic organisms is thought to be directly ancestral to the plant kingdom? A) Golden algae B) Radiolarians C) Foraminiferans D) Apicomplexans E) Green algae
Green algae
57) Test tube 3 contains A) Paramecium B) Navicula (diatom) C) Pfiesteria (dinoflagellate) D) Entamoeba E) Plasmodium
Navicula (diatom)
56) Test tube 5 contains A) Paramecium B) Navicula (diatom) C) Pfiesteria (dinoflagellate) D) Entamoeba E) Plasmodium
Paramecium
34) This phylum formerly included the members of the new phylum Glomeromycota: A) Zygomycota B) Ascomycota C) Basidiomycota D) Glomeromycota E) Chytridiomycota
Zygomycota
46) Which of the following is correctly described as a primary producer? A) oomycete B) kinetoplastid C) apicomplexan D) diatom E) radiolarian
diatom
14) Which of the following terms is correctly associated with fungi in general? A) sporophytes B) make only sexually produced spores C) ecologically important D) polyphyletic E) ingestive nutrition
ecologically important
62) Lichens are symbiotic associations of fungi and A) mosses. B) cyanobacteria. C) green algae. D) either A or B E) either B or C
either B or C
71) Which term below refers to symbiotic relationships that involve fungi living between the cells in plant leaves? A) pathogens B) endosymbioses C) endophytes D) lichens E) mycorrhizae
endophytes
18) Which process occurs in fungi and has the opposite effect on a cellʹs chromosome number than does meiosis I? A) mitosis B) plasmogamy C) crossing-over D) binary fission E) karyogamy
karyogamy
65) The motility that permits P. bursaria to move toward a light source is provided by A) pseudopods. B) a single flagellum composed of the protein, flagellin. C) a single flagellum featuring the 9+2 pattern. D) many cilia. E) contractile vacuoles.
many cilia
56) At which location is the mycelium currently absorbing the most nutrients per unit surface area, per unit time? ..
A..
1) Protists are alike in that all are A) unicellular. B) eukaryotic. C) symbionts. D) monophyletic. E) autotrophic.
eukaryotic.
7) What is the primary role of a mushroomʹs underground mycelium? A) absorbing nutrients B) anchoring C) sexual reproduction D) asexual reproduction E) protection
absorbing nutrients
28) Which of these structures are most likely to be a component of both chytrid zoospores and motile animal cells? A) cilia B) flagella C) pseudopods D) heterokaryons E) haustoria
flagella
24) Regarding prokaryotic reproduction, which statement is correct? A) Prokaryotes form gametes by meiosis. B) Prokaryotes feature the union of haploid gametes, as do eukaryotes. C) Prokaryotes exchange some of their genes by conjugation, the union of haploid gametes, and transduction. D) Mutation is a primary source of variation in prokaryote populations. E) Prokaryotes skip sexual life cycles because their life cycle is too short.
Mutation is a primary source of variation in prokaryote populations.
17) Which of the following requires ATP to function, and permits some species to respond to taxes (plural of taxis)? A) endospore B) sex pilus C) flagellum D) cell wall E) capsule
flagellum
20) Which of the following is a structure that permits conjugation to occur? A) endospore B) sex pilus C) flagellum D) cell wall E) capsule
sex pilus
54) What is the most probable location of the oldest portion of this mycelium?
C
58) Assume now that all four locations are 0.5 m above the surface. On a breezy day with prevailing wings blowing from left to right, where should one expect to find the highest concentration of free basidiospores in an air sample? ..
D..
42) The best evidence for not classifying the slime molds as fungi comes from slime moldsʹ A) DNA sequences. B) nutritional modes. C) choice of habitats. D) physical appearance. E) reproductive methods.
DNA sequences.
71) Which conclusion is consistent with the data presented in Figure 28.2 above? A) Co-adaptation between P. bursaria and the native strain of Chlorella has occurred. B) All types of Chlorella tested are tolerated equally well by P. bursaria. C) P. bursaria cannot reproduce in the absence of zoochlorellae as well as it can when zoochlorellae are present. D) Zoochlorellae derived from other protists are well adapted to survive within P. bursaria, relative to the native strain.
Co-adaptation between P. bursaria and the native strain of Chlorella has occurred.
60) Which of the following statements concerning living phytoplanktonic organisms are true? 1. They are important members of communities surrounding deep-sea hydrothermal vents. 2. They are important primary producers in most aquatic food webs. 3. They are important in maintaining oxygen in Earthʹs seas and atmosphere. 4. They are most often found growing in the sediments of seas and oceans. 5. They can be so concentrated that they affect the color of seawater. A) 1 and 4 B) 1, 2, and 4 C) 2, 3, and 4 D) 2, 3, and 5 E) 3, 4, and 5
2 3 and 5
1. autotroph 2. heterotroph 3. phototroph 4. chemotroph 42) an organism that obtains both carbon and energy by ingesting prey A) 1 Only B) 4 Only C) 1 And 3 D) 2 And 4 E) 1, 3, And 4
2 And 4
48) You are given the task of designing an aerobic, mixotrophic protist that can perform photosynthesis in fairly deep water (e.g., 250 m deep), and can also crawl about and engulf small particles. With which two of these structures would you provide your protist? 1. hydrogenosome 2. apicoplast 3. pseudopods 4. chloroplast from red alga 5. chloroplast from green alga A) 1 and 2 B) 2 and 3 C) 2 and 4 D) 3 and 4 E) 4 and 5
3 and 4
47) Arrange the following from largest to smallest: 1. ascospore 2. ascocarp 3. ascomycete 4. ascus A) 3 → 4 → 2 → 1 B) 3 → 2 → 4 → 1 C) 3 → 4 → 1 → 2 D) 2 → 3 → 4 → 1 E) 2 → 4 → 1 → 3
3241
26) Which of the following is characterized by the lack of an observed sexual phase in its membersʹ life cycle? A) Glomeromycota B) Basidiomycota C) Chytridiomycota D) Deuteromycota E) Zygomycota
Deuteromycota
58) Test tube 1 contains A) Paramecium B) Navicula (diatom) C) Pfiesteria (dinoflagellate) D) Entamoeba E) Plasmodium
Entamoeba
8) What do fungi and arthropods have in common? A) Both groups are commonly coenocytic. B) The haploid state is dominant in both groups. C) Both groups are predominantly heterotrophs that ingest their food. D) The protective coats of both groups are made of chitin. E) Both groups have cell walls.
The protective coats of both groups are made of chitin.
12) The typical prokaryotic flagellum features A) an internal 9 + 2 pattern of microtubules. B) an external covering provided by the plasma membrane. C) a complex ʺmotorʺ embedded in the cell wall and plasma membrane. D) a basal body that is similar in structure to the cellʹs centrioles.
a complex ʺmotorʺ embedded in the cell wall and plasma membrane.
31) The multicellular condition of animals and fungi seems to have arisen A) due to common ancestry. B) by convergent evolution. C) by inheritance of acquired traits. D) by natural means, and is a homology. E) by serial endosymbioses.
by convergent evolution.
1) All fungi share which of the following characteristics? A) symbiotic B) heterotrophic C) flagellated D) pathogenic E) act as decomposers
heterotrophic
26) Waterʹs density and, consequently, its buoyancy decrease at warmer temperatures. Based on this consideration and using data from Table 28.1, at which time of year should one expect diatoms to be storing excess calories mostly as oil? A) mid-winter B) early spring C) late summer D) late fall
late summer
20) What is the ploidy of a single mature ascospore? A) monoploid B) diploid C) triploid D) tetraploid E) polyploid
monoploid
38) A biologist discovers an alga that is marine, multicellular, and lives at a depth reached only by blue light. This alga probably belongs to which group? A) red algae B) brown algae C) green algae D) dinoflagellates E) golden algae
red algae
19) If a single, diploid G2 nucleus in an ascus contains 400 nanograms (ng) of DNA, then a single ascospore nucleus of this species should contain how much DNA (ng), carried on how many chromosomes? A) 100, 7 B) 100, 14 C) 200, 7 D) 200, 14 E) 400, 14
100, 7
29) Theoretically, which two of the following present the richest potential sources of silica? 1. marine sediments consisting of foram tests 2. marine sediments consisting of diatom cases (valves) 3. marine sediments consisting of radiolarian shells 4. marine sediments consisting of dinoflagellate plates A) 1 and 2 B) 1 and 4 C) 2 and 3 D) 2 and 4 E) 3 and 4
2 and 3
59) Which of the following traits do archaeans and bacteria share? 1. composition of the cell wall 2. presence of plasma membrane 3. lack of a nuclear envelope 4. identical rRNA sequences A) 1 only B) 3 only C) 1 and 3 D) 2 and 3 E) 2 and 4
2 and 3
80) Say S. schenkii had initially been classified as a deuteromycete. Asci were later discovered in the pus that oozed from an ulcerated lymph node, and the spores therein germinated, giving rise to S. schenkii yeasts. Which two of these are conclusions that make sense on the basis of this information? 1. S. schenkii produces asexual spores within lymph nodes. 2. S. schenkii should be reclassified. 3. S. schenkii continues to have no known sexual stage. 4. The hyphae growing in lymphatic vessels probably belonged to a different fungal species. 5. S. schenkii yeasts belonging to two different mating strains were introduced by the same thorn prick. A) 1 and 3 B) 1 and 5 C) 2 and 3 D) 2 and 5 E) 4 and 5
2 and 5
1. autotroph 2. heterotroph 3. phototroph 4. chemotroph 43) an organism that relies on photons to excite electrons within its membranes A) 1 only B) 3 only C) 1 and 3 D) 2 and 4 E) 1, 3, and 4
3 only
49) Arrange the following from largest to smallest, assuming that they all come from the same fungus. 1. basidiocarp 2. basidium 3. basidiospore 4. mycelium 5. gill A) 4, 5, 1, 2, 3 B) 5, 1, 4, 2, 3 C) 5, 1, 4, 3, 2 D) 5, 1, 3, 2, 4 E) 4, 1, 5, 2, 3
4, 1, 5, 2, 3
74) Is P. bursariaʹs ability to detect and move toward light an innate ability, or is it due to the presence of zoochlorellae? Arrange the following steps in the proper sequence needed to answer this question. 1. Introduce P. bursaria from both the experimental and control populations to an aquarium that lacks free-living Chlorella, but that contains bacterial prey. 2. Remove equal amounts of water from the well-lit side of the aquarium and the poorly lit side of the aquarium, census the number and kind of P. bursaria present in each sample. 3. Shine light on only one side of the aquarium containing aposymbiotic P. bursaria. 4. Expose one population of P. bursaria (the experimental population) to an herbicide to kill its zoochlorellae. 5. Collect healthy P. bursaria from the well-lit side of an aquarium and divide it into two equal populations: a control population and an experimental population. A) 5 → 4 → 1 → 2 → 3 B) 5 → 4 → 1 → 3 → 2 C) 4 → 1 → 5 → 3 → 2 D) 2 → 5 → 4 → 1 → 3 E) 2 → 5 → 4 → 3 → 1
54132
55) Which location is nearest to basidiocarps?
A
72) The researchers decided to perform the same experiment over again, only this time, withdrawing P. bursaria samples every other day for testing to get a better picture of the fate of each Chlorella strain over time. Which graph below is most consistent with the results depicted in Figure 28.2, assuming that P. bursaria ingests the various Chlorella strains indiscriminately?
A (lines equally spread out)
11) The vegetative (nutritionally active) bodies of most fungi are A) composed of hyphae. B) referred to as a mycelium. C) usually underground. D) A and B only E) A, B, and C
A B and C
5) Which protists are in the same eukaryotic ʺsupergroupʺ as land plants? A) green algae B) dinoflagellates C) red algae D) brown algae E) A and C are both correct
A and C are both correct
2) The hydrolytic digestion of which of the following should produce monomers that are aminated (i.e., have an amine group attached) molecules of beta-glucose? A) insect exoskeleton B) plant cell walls C) fungal cell walls D) A and C only E) A, B and C
A and C only
73) Sexual reproduction has never been observed among the fungi that produce the blue-green marbling of blue cheeses. What is true of these fungi and others that do not have a sexual stage? A) They are currently classified among the deuteromycetes. B) They do not form heterokaryons. C) Their spores are produced by mitosis. D) Only A and B are correct. E) A, B, and C are correct.
A, B, and C are correct.
58) If archaeans are more closely related to eukaryotes than to bacteria, then which of the following is a reasonable prediction? A) Archaean DNA should have no introns. B) Archaean chromosomes should have no protein bonded to them. C) Archaean DNA should be single-stranded. D) Archaean ribosomes should be larger than typical prokaryotic ribosomes. E) Archaeans should lack cell walls.
Archaean ribosomes should be larger than typical prokaryotic ribosomes.
36) This phylum contains the mushrooms, shelf fungi, and puffballs: A) Zygomycota B) Ascomycota C) Basidiomycota D) Glomeromycota E) Chytridiomycota
Basidiomycota
48) In which phylum are mushrooms and toadstools classified? A) Basidiomycota B) Ascomycota C) Deuteromycota D) Zygomycota E) Chytridiomycota
Basidiomycota
33) This phylum contains organisms that most closely resemble the common ancestor of fungi and animals: A) Zygomycota B) Ascomycota C) Basidiomycota D) Glomeromycota E) Chytridiomycota
Chytridiomycota
57) At which location should one find the lowest concentration of fungal enzymes, assuming that the enzymes do not diffuse far from their source, and that no other fungi are present in this habitat?
D
70) Can P. bursaria live in association with any and all strains/species of Chlorella? In an experiment to help answer this question, Chlorella was collected, and cultured separately, from three different sources: (1) P. bursaria cytoplasm, (2) free-living Chlorella, and (3) from cytoplasm of other protist species. A population of P. bursaria was treated with the herbicide, paraquat, which killed all of its zoochlorellae, but otherwise left P. bursaria unharmed. The zoochlorella-free paramecia were then introduced to a 1:1:1 mixture of Chlorella from the three cultures listed above, and subsequently reestablished a contingent of zooclorellae. Two weeks later, zoochlorellae were collected from the P. bursaria cells and tested to determine which Chlorella strain(s) had been maintained within P. bursaria. The different strains of Chlorella are morphologically indistinguishable. Consequently, which of these would be the best test to perform on Chlorella, both before and after re-establishment of zoochlorellae, to determine which Chlorella strains had been maintained within P. bursaria? A) Determine the chemical composition of its cell wall. B) Determine the absorption spectrum of its photosynthetic pigments. C) Determine the sequence of a portion of its mitochondrial DNA. D) Determine the sequence of an exon of a ribosomal RNA gene. E) Determine the endosymbiontʹs diameter.
Determine the sequence of a portion of its mitochondrial DNA.
27) A biologist is trying to classify a newly discovered fungus on the basis of the following characteristics: filamentous appearance, reproduction by asexual spores, no apparent sexual phase, and parasitism of woody plants. If asked for advice, to which group would you assign this new species? A) Deuteromycota. B) Zygomycota. C) Ascomycota. D) Basidiomycota. E) Glomeromycota.
Deuteromycota.
79) The answer to which of these questions would be of most assistance to one who is attempting to assign the genus Sporothrix to the correct fungal phylum? A) Do these yeasts perform fermentation while growing on the rose-bush thorns, or do they wait until inside a human host? B) Does S. schenkii rely on animal infection to complete some part of its life cycle, or is the infection merely opportunistic? C) Are the hyphae in lymphatic vessels septate, or are they coenocytic? D) Is S. schenkii best described as a decomposer, parasite, pathogen, or mutualist of humans? E) Being a yeast, does S. schenkii perform the process of budding?
Does S. schenkii rely on animal infection to complete some part of its life cycle, or is the infection merely opportunistic?
23) Diatoms are mostly asexual members of the phytoplankton. Diatoms lack any organelles that might have the 9+2 pattern. They obtain their nutrition from functional chloroplasts, and each diatom is encased within two porous, glasslike valves. Which question would be most important for one interested in the day-to-day survival of individual diatoms? A) How does carbon dioxide get into these protists with their glasslike valves? B) How do diatoms get transported from one location on the waterʹs surface layers to another location on the surface? C) How do diatoms with their glasslike valves keep from sinking into poorly lit waters? D) How do diatoms with their glasslike valves avoid being shattered by the action of waves? E) How do diatom sperm cells locate diatom egg cells?
How do diatoms with their glasslike valves keep from sinking into poorly lit waters?
72) If Penicillium typically secretes penicillin without disturbing the lichen relationship in which it is engaged, then what must have been true about its partner? A) It should have lacked peptidoglycan in its cell wall. B) It was probably a red alga. C) It was probably a member of the domain Bacteria. D) It was probably a heterotrophic prokaryote. E) It was probably infected by bacteriophage.
It should have lacked peptidoglycan in its cell wall
32) Asexual reproduction in yeasts occurs by budding. Due to unequal cytokinesis, the ʺbudʺ cell receives less cytoplasm than the parent cell. Which of the following should be true of the smaller cell until it reaches the size of the larger cell? A) It should produce fewer fermentation products per unit time. B) It should produce ribosomal RNA at a slower rate. C) It should be transcriptionally less active. D) It should have reduced motility. E) It should have a smaller nucleus.
It should produce fewer fermentation products per unit time.
41) If the Archaeplastidae are eventually designated a kingdom, and if the land plants are excluded from this kingdom, then what will be true of this new kingdom? A) It will be monophyletic. B) It will more accurately depict evolutionary relationships than does the current taxonomy. C) It will be paraphyletic. D) It will be a true clade. E) It will be polyphyletic.
It will be paraphyletic.
51) Similar to most amoebozoans, the forams and the radiolarians also have pseudopods, as do the white blood cells of animals. If one were to erect a taxon that included all organisms that have cells with pseudpods, what would be true of such a taxon? A) It would be polyphyletic. B) It would be paraphyletic. C) It would be monophyletic. D) It would include all eukaryotes.
It would be polyphyletic.
33) Typically as cells grow, their increase in volume outpaces their increase in surface area, and continued survival requires undergoing asexual reproduction to reestablish a healthy surface area to volume ratio. Thus, which of these is least likely to contribute to the ability of a single-celled foraminiferan to grow to a diameter of several centimeters? A) Its threadlike pseudopods dramatically increase its surface area to volume ratio. B) Its symbiotic algae provide oxygen to the cytoplasm. C) Its symbiotic algae absorb metabolic waste products from the cytoplasm. D) Its symbiotic algae provide glucose to the cytoplasm. E) Its calcium carbonate test contributes extra mass.
Its calcium carbonate test contributes extra mass.
66) If all mycorrhizae were somehow disrupted, then which of the following would be true? A) There would be fewer infectious diseases. B) We wouldnʹt have any antibiotics. C) There would be no mushrooms for pizza. D) Most vascular plants would be stunted in their growth. E) Cheeses like blue cheese or Roquefort would not exist.
Most vascular plants would be stunted in their growth.
54) Test tube 2 contains A) Paramecium B) Navicula (diatom) C) Pfiesteria (dinoflagellate) D) Entamoeba E) Plasmodium
Pfiesteria (dinoflagellate)
67) Which of the following best describes the physical relationship of the partners involved in lichens? A) Fungal cells are enclosed within algal cells. B) Lichen cells are enclosed within fungal cells. C) Photosynthetic cells are surrounded by fungal hyphae. D) The fungi grow on rocks and trees and are covered by algae. E) Algal cells and fungal cells mix together without any apparent structure.
Photosynthetic cells are surrounded by fungal hyphae.
55) Test tube 4 contains A) Paramecium B) Navicula (diatom) C) Pfiesteria (dinoflagellate) D) Entamoeba E) Plasmodium
Plasmodium
73) Which of these precautions would have been most important to insuring the validity of the results? A) Chlorella in the three cultures were genetically identical. B) Roughly equal numbers of each strain of Chlorella were present in the reintroduction mixture. C) The Chlorella cultures were free of bacteria. D) The P. bursaria culture was free of bacteria. E) The Chlorella DNA contained no introns.
Roughly equal numbers of each strain of Chlorella were present in the reintroduction mixture.
21) Each of the eight ascospores present at the end of mitosis has the same chromosome number and DNA content (ng) as each of the four cells at the end of meiosis. What must have occurred in each spore between the round of meiosis and the round of mitosis? A) double fertilization B) crossing-over C) nondisjunction D) autopolyploidy E) S phase
S phase
4) Based on the phylogenetic tree in Figure 28.3 in the text, which of the following statements is correct? A) The most recent common ancestor of Excavata is older than that of Chromalveolata. B) The most recent common ancestor of Chromalveolata is older than that of Rhizaria. C) The most recent common ancestor of red algae and land plants is older than that of nucleariids and fungi. D) The most basal (first to diverge) eukaryotic supergroup cannot be determined. E) Excavata is the most basal eukaryotic supergroup.
The most recent common ancestor of red algae and land plants is older than that of nucleariids and fungi.
45) Which of the following statements concerning protists is false? A) All protists are eukaryotic organisms; many are unicellular or colonial. B) The primary organism that transmits malaria to humans by its bite is the tsetse fly. C) All apicomplexans are parasitic. D) Cellular slime molds have an amoeboid stage that may be followed by a stage during which spores are produced. E) Euglenozoans that are mixotrophic contain chloroplasts.
The primary organism that transmits malaria to humans by its bite is the tsetse fly.
69) Theoretically, P.bursaria can obtain zoochlorella either vertically (via the asexual reproduction of its mother cell) or horizontally (by ingesting free-living Chlorella from its habitat). Consider a P. bursaria cell containing zoochlorellae, but whose habitat lacks free-living Chlorella. If this cell subsequently undergoes many generations of asexual reproduction, if all of its daughter cells contain roughly the same number of zoochlorellae as it had originally contained, and if the zoochlorellae are all haploid and identical in appearance, then what is true? A) The zoochlorellae also reproduced asexually, at an increasing rate over time. B) The zoochlorellae also reproduced asexually, at a decreasing rate over time. C) The zoochlorellae also reproduced asexually, at a fairly constant rate over time. D) The zoochlorellae reproduced sexually, undergoing heteromorphic alternation of generations. E) The zoochlorellae reproduced sexually, undergoing isomorphic alternation of generations.
The zoochlorellae also reproduced asexually, at a fairly constant rate over time.
81) Humans have immune systems in which lymph nodes are important, because many phagocytes and lymphocytes reside therein. Given that a successful infection by S. schenkii damages lymph nodes themselves, which of these is most probable? A) The hyphae secrete antibiotics, which increases the ability of the infected human to tolerate the fungus. B) Their conversion from yeast to hyphal morphology allows such fast growth that the bodyʹs defenses are at least temporarily overwhelmed. C) Defensive cells of humans cannot detect foreign cells that are covered with cell walls composed of cellulose. D) Given that most fungal pathogens attack plants, human defenses are simply not adapted to seek out and destroy fungi. E) Given that most fungal pathogens of humans infect only the skin, human defenses are not adapted to seek out and destroy systemic fungal infections.
Their conversion from yeast to hyphal morphology allows such fast growth that the bodyʹs defenses are at least temporarily overwhelmed.
5) Which of the following is a characteristic of hyphate fungi (fungi featuring hyphae)? A) They acquire their nutrients by phagocytosis. B) Their body plan is a unicellular sphere. C) Their cell walls consist mainly of cellulose microfibrils. D) They are adapted for rapid directional growth to new food sources. E) They reproduce asexually by a process known as budding.
They are adapted for rapid directional growth to new food sources.
23) Which of the following statements is true of deuteromycetes? A) They are the second of five fungal phyla to have evolved. B) They represent the phylum in which all the fungal components of lichens are classified. C) They are the group of fungi that have, at present, no known sexual stage. D) They are the group that includes molds, yeasts, and lichens. E) They include the imperfect fungi that lack hyphae.
They are the group of fungi that have, at present, no known sexual stage.
34) What makes certain red algae appear red? A) They live in warm coastal waters. B) They possess pigments that reflect and transmit red light. C) They use red light for photosynthesis. D) They lack chlorophyll. E) They contain the pigment bacteriorhodopsin.
They possess pigments that reflect and transmit red light
69) How are the vascular plants that are involved in mycorrhizae and the photosynthetic cells that are involved in lichens alike? A) They provide organic nutrients to fungal partners. B) They secrete acids that keep the fungal partner from growing too quickly. C) They are in intimate associations with chytrids. D) They are digested by fungal enzymes while still alive. E) They contain endosymbiotic fungi.
They provide organic nutrients to fungal partners.
25) The following are all characteristic of the water molds (oomycetes) except A) the presence of filamentous feeding structures. B) flagellated zoospores. C) a nutritional mode that can result in the decomposition of dead organic matter. D) a morphological similarity to fungi that is the result of evolutionary convergence. E) a feeding plasmodium.
a feeding plasmodium.
1) Which of the following do all fungi have in common? A) meiosis in basidia B) coenocytic hyphae C) sexual life cycle D) absorption of nutrients E) symbioses with algae
absorption of nutrients
67) A P. bursaria cell that has lost its zoochlorellae is said to be ʺaposymbiotic.ʺ It might be able to replenish its contingent of zoochlorellae by ingesting them without subsequently digesting them. Which of these situations would be most favorable to the re -establishment of resident zoochlorellae, assuming compatible Chlorella are present in P. bursariaʹs habitat? A) abundant light, no bacterial prey B) abundant light, abundant bacterial prey C) no light, no bacterial prey D) no light, abundant bacterial prey
abundant light, abundant bacterial prey
2) Biologists suspect that endosymbiosis gave rise to mitochondria before plastids partly because A) the products of photosynthesis could not be metabolized without mitochondrial enzymes. B) all eukaryotes have mitochondria (or their remnants), whereas many eukaryotes do not have plastids. C) mitochondrial DNA is less similar to prokaryotic DNA than is plastid DNA. D) without mitochondrial CO2 production, photosynthesis could not occur. E) mitochondrial proteins are synthesized on cytosolic ribosomes, whereas plastids utilize their own ribosomes.
all eukaryotes have mitochondria (or their remnants), whereas many eukaryotes do not have plastids.
50) Some protists, formerly united as the ʺamitochondriateʺ clade, have recently been shown to be rather diverse. Some of them possess neither mitochondria nor mitochondrial genes (and have been classified as fungi). Others possess no mitochondria, but do have mitochondrial genes in their nuclear genome. Still others have modified mitochondria (viz. mitosomes or hydrogenosomes). Which statement(s) represent(s) consequences of these recent findings? 1. The amitochondriates do not comprise a true clade. 2. The ʺamitochondriate hypothesisʺ concerning the root of the eukaryotic tree has been strengthened. 3. Just as there is a diversity of cyanobacterial descendants among eukaryotes, so too is there a diversity of alpha-proteobacterial descendants among the eukaryotes. 4. If the amitochondriate organisms continued to be recognized as a taxon, this taxon would be polyphyletic. 5. Horizontal gene transfer involving mitochondrial genes has occurred in some amitochondriate organisms.
all except 2
59) Which of these are actual mutualistic partnerships that involve a protist and a host organism? A) cellulose-digesting gut protists : wood-eating termites B) dinoflagellates : reef-building coral animals C) Trichomonas : humans D) algae : certain foraminiferans E) all except C
all except C
4) The adaptive advantage associated with the filamentous nature of fungal mycelia is primarily related to A) the ability to form haustoria and parasitize other organisms. B) avoiding sexual reproduction until the environment changes. C) the potential to inhabit almost all terrestrial habitats. D) the increased probability of contact between different mating types. E) an extensive surface area well suited for invasive growth and absorptive nutrition.
an extensive surface area well suited for invasive growth and absorptive nutrition.
6) Among the organisms listed here, which are thought to be the closest relatives of fungi? A) animals B) vascular plants C) mosses D) brown algae E) slime molds
animals
61) Chemicals, secreted by soil fungi, that inhibit the growth of bacteria, are known as A) antibodies. B) aflatoxins. C) hallucinogens. D) antigens. E) antibiotics.
antibiotics.
52) You are designing an artificial drug-delivery ʺcellʺ that can penetrate animal cells. Which of these protist structures should provide the most likely avenue for research along these lines? A) pseudopods B) apical complex C) excavated feeding grooves D) nucleomorphs E) mitosomes
apical complex
44) Which of the following correctly pairs a protist with one of its characteristics? A) diplomonads : micronuclei involved in conjugation B) ciliates : pseudopods C) apicomplexans : parasitic D) gymnamoebas : calcium carbonate test E) foraminiferans : abundant in soils
apicomplexans : parasitic
39) Green algae often differ from land plants in that some green algae A) are heterotrophs. B) are unicellular. C) have plastids. D) have alternation of generations. E) have cell walls containing cellulose.
are unicellular.
44) You are given an organism to identify. It has a fruiting body that contains many structures with eight haploid spores lined up in a row. What kind of a fungus is this? A) zygomycete B) ascomycete C) deuteromycete D) chytrid E) basidiomycete
ascomycete
51) Among sac fungi, which of these correctly distinguishes ascospores from conidia? A) ascospores are diploid, conidia are haploid B) ascospores are produced only by meiosis, conidia are produced only by mitosis C) ascospores have undergone genetic recombination during their production, conidia have not D) ascospores are larger, conidia are smaller E) ascospores will germinate into haploid hyphae, conidia will germinate into diploid hyphae
ascospores have undergone genetic recombination during their production, conidia have not
40) What are the sporangia of the bread mold Rhizopus? A) asexual structures that produce haploid spores B) asexual structures that produce diploid spores C) sexual structures that produce haploid spores D) sexual structures that produce diploid spores E) vegetative structures with no role in reproduction
asexual structures that produce haploid spores
50) Mushrooms with gills have meiotically produced spores located in or on A) asci. B) conidiophores. C) basidia. D) soredia. E) zygosporangia.
basidia
53) A gelatinous seaweed that grows in shallow, cold water and undergoes heteromorphic alternation of generations is most probably what type of alga? A) red B) green C) brown D) yellow
brown
35) The largest seaweeds belong to which group? A) red algae B) green algae C) brown algae D) golden algae
brown algae
78) Orchid seeds are tiny, with virtually no endosperm and with miniscule cotyledons. If such seeds are deposited in a dark, moist environment then which of these represents the most likely means by which fungi might assist in seed germination, given what the seeds lack? A) by transferring some chloroplasts to the embryo in each seed B) by providing the seeds with water and minerals C) by providing the embryos with some of the organic nutrients they have absorbed D) by strengthening the seed coat that surrounds each seed
by providing the embryos with some of the organic nutrients they have absorbed
12) Both fungus-farming ants and their fungi can synthesize the same structural polysaccharide from the beta-glucose. What is this polysaccharide? A) amylopectin B) chitin C) cellulose D) lignin E) glycogen
chitin
39) Zygosporangia are to zygomycetes as basidia are to A) basal fungi. B) chytrids. C) sac fungi. D) basidiospores. E) club fungi.
club fungi.
27) Judging from Table 28.1 and given that waterʹs density and, consequently, its buoyancy decrease at warmer temperatures, in which environment should diatoms (and other suspended particles) sink most slowly? A) cold freshwater B) warm freshwater C) cold seawater D) warm seawater E) warm brackish water
cold seawater
29) Fossil fungi date back to the origin and early evolution of plants. What combination of environmental and morphological change is similar in the evolution of both fungi and plants? A) presence of ʺcoal forestsʺ and change in mode of nutrition B) periods of drought and presence of filamentous body shape C) predominance in swamps and presence of cellulose in cell walls D) colonization of land and loss of flagellated cells E) continental drift and mode of spore dispersal
colonization of land and loss of flagellated cells
68) A P. bursaria cell that has lost its zoochlorellae is ʺaposymbiotic.ʺ If aposymbiotic cells have population growth rates the same as those of healthy, zoochlorella-containing P. bursaria in well-lit environments with plenty of prey items, then such an observation would be consistent with which type of relationship? A) parasitic B) commensalistic C) toxic D) predator-prey E) mutualistic
commensalistic
46) Which of these is a fungal structure that is usually associated with asexual reproduction? A) zygosporangium B) basidium C) conidiophore D) ascus E) antheridium
conidiophore
3) Which of the following cells or structures are associated with asexual reproduction in fungi? A) ascospores B) basidiospores C) zygosporangia D) conidiophores E) ascocarps
conidiophores
53) In what structures do both Penicillium and Aspergillus produce asexual spores? A) asci B) zygosporangia C) rhizoids D) gametangia E) conidiophores
conidiophores
36) The chloroplasts of land plants are thought to have been derived according to which evolutionary sequence? A) cyanobacteria → green algae → land plants B) cyanobacteria → green algae → fungi → land plants C) red algae → brown algae → green algae → land plants D) red algae → cyanobacteria → land plants E) cyanobacteria → red algae → green algae → land plants
cyanobacteria, green algae, land plants
52) A fungal spore germinates, giving rise to a mycelium that grows outward into the soil surrounding the site where the spore originally landed. Which of these accounts for the fungal movement, as described here? A) karyogamy B) mycelial flagella C) alternation of generations D) breezes distributing spores E) cytoplasmic streaming in hyphae
cytoplasmic streaming in hyphae
49) You are given the task of designing an aquatic protist that is a primary producer. It cannot swim on its own, yet must stay in well-lit surface waters. It must be resistant to physical damage from wave action. It should be most similar to a(n) A) diatom. B) dinoflagellate. C) apicomplexan. D) red alga. E) radiolarian.
diatom.
47) A certain unicellular eukaryote has a siliceous (glasslike) shell and autotrophic nutrition. To which group does it belong? A) dinoflagellates B) diatoms C) brown algae D) radiolarians E) oomycetes
diatoms
17) If all of their nuclei are equally active transcriptionally then, in terms of the gene products they can make, the cells of both dikaryotic and heterokaryotic fungi are essentially A) haploid. B) diploid. C) alloploid. D) completely homozygous. E) completely hemizygous.
diploid.
77) Which of the following conditions is caused by a fungus that is accidentally consumed along with rye flour? A) ergotism B) athleteʹs foot C) ringworm D) candidiasis (Candida yeast infection) E) coccidioidomycosis
ergotism
2) Which feature seen in chytrids supports the hypothesis that they diverged earliest in fungal evolution? A) the absence of chitin within the cell wall B) coenocytic hyphae C) flagellated spores D) formation of resistant zygosporangia E) parasitic lifestyle
flagellated spores
32) A snail-like, coiled, porous test (shell) of calcium carbonate is characteristic of which group? A) diatoms B) foraminiferans C) radiolarians D) gymnamoebas E) ciliates
foraminiferans
4) When a mycelium infiltrates an unexploited source of dead organic matter, what are most likely to appear within the food source soon thereafter? A) fungal haustoria B) soredia C) fungal enzymes D) increased oxygen levels E) larger bacterial populations
fungal enzymes
70) When pathogenic fungi are found growing on the roots of grape vines, grape farmers sometimes respond by covering the ground around their vines with plastic sheeting and pumping a gaseous fungicide into the soil. The most important concern of grape farmers who engage in this practice should be that the A) fungicide might also kill the native yeasts residing on the surfaces of the grapes. B) fungicide isnʹt also harmful to insect pests. C) lichens growing on the vinesʹ branches are not harmed. D) fungicide might also kill mycorrhizae. E) sheeting is transparent so that photosynthesis can continue.
fungicide might also kill mycorrhizae.
6) The functional significance of porous septa in certain fungal hyphae is most similar to that represented by which pair of structures in animal cells and plant cells, respectively? A) desmosomes : tonoplasts B) gap junctions : plasmodesmata C) tight junctions : plastids D) centrioles : plastids E) flagella : central vacuoles
gap junctions : plasmodesmata
66) If the chloroplasts of the zoochlorellae are very similar to those found in the photosynthetic cells of land plants, then Chlorella is probably what type of alga? A) red B) green C) brown D) golden
green
5) The photosynthetic symbiont of a lichen is often a(n) A) moss. B) green alga. C) brown alga. D) ascomycete. E) small vascular plant.
green alga.
37) The chloroplasts of all of the following are derived from ancestral red algae, except those of A) golden algae. B) diatoms. C) dinoflagellates. D) green algae. E) brown algae.
green algae.
43) Which of these paired fungal structures are structurally and functionally most alike? A) conidia and basidiocarps B) sporangia and hyphae C) soredia and gills D) haustoria and arbuscules E) zoospores and mycelia
haustoria and arbuscules
24) A large seaweed that floats freely on the surface of deep bodies of water would be expected to lack which of the following? A) thalli B) bladders C) blades D) holdfasts E) gel-forming polysaccharides
holdfasts
76) Mycorrhizae are to the roots of vascular plants as endophytes are to vascular plantsʹ A) leaf mesophyll. B) stem apical meristems. C) root apical merisems D) xylem. E) waxy cuticle.
leaf mesophyll.
13) Consider two hyphae having equal dimensions: one from a septate species and the other from a coenocytic species. Compared with the septate species, the coenocytic species should have A) fewer nuclei. B) more pores. C) less chitin. D) less cytoplasm. E) reduced cytoplasmic streaming.
less chitin.
15) Which of the following vary tremendously from each other in morphology and belong to several fungal phyla? A) lichens B) ascomycetes C) club fungi D) arbuscular mycorrhizae E) ergot fungi
lichens
45) Which has the least affiliation with all of the others? A) Glomeromycota B) mycorrhizae C) lichens D) arbuscules E) mutualistic fungi
lichens
68) If haustoria from the fungal partner were to appear within the photosynthetic partner of a lichen, and if the growth rate of the photosynthetic partner consequently slowed substantially, then this would support the claim that A) algae and cyanobacteria are autotrophic. B) lichens are not purely mutualistic relationships. C) algae require maximal contact with the fungal partner in order to grow at optimal rates. D) fungi get all of the nutrition they need via the ʺleakinessʺ of photosynthetic partners. E) soredia are asexual reproductive structures combining both the fungal and photosynthetic partners.
lichens are not purely mutualistic relationships.
64) If both host and alga can survive apart from each other, then which of these best accounts for their ability to live together? A) genome fusion B) horizontal gene transfer C) genetic recombination D) conjugation E) metabolic cooperation
metabolic cooperation
61) Which term most accurately describes the nutritional mode of healthy P. bursaria? A) photoautotroph B) photoheterotroph C) chemoheterotroph D) chemoautotroph E) mixotroph
mixotroph
6) In life cycles with an alternation of generations, multicellular haploid forms alternate with A) unicellular haploid forms. B) unicellular diploid forms. C) multicellular haploid forms. D) multicellular diploid forms. E) multicellular polyploid forms.
multicellular diploid forms.
63) Which term best describes the symbiotic relationship of well-fed P. bursaria to their zoochlorellae? A) mutualistic B) commensal C) parasitic D) predatory E) pathogenic
mutualistic
65) The symbiotic associations involving roots and soil fungi are considered A) parasitic. B) mutualistic. C) commensal. D) harmful to the plant partner. E) the beginning stages of the formation of soil.
mutualistic.
62) Which term accurately describes the behavior of Paramecium species that lack zoochlorellae in an aquarium with light coming from one side only? A) positive chemotaxis B) negative chemotaxis C) positive phototaxis D) negative phototaxis
negative phototaxis
30) Which of the following characteristics is shared by both chytrids and other kinds of fungi? A) presence of flagella B) zoospores C) autotrophic mode of nutrition D) cell walls of cellulose E) nucleotide sequences of several genes
nucleotide sequences of several genes
25) A chemical secreted by a female Bombyx moth helps the male of the species locate her, at which time sexual reproduction may occur. This chemical is most similar in function to which chemicals used by sexually reproducing fungi? A) chitin B) enzymes C) lysergic acids D) aflatoxins E) pheromones
pheromones
22) Fungal cells can reproduce asexually by undergoing mitosis followed by cytokinesis. Many fungi can also prepare to reproduce sexually by undergoing A) cytokinesis followed by karyokinesis. B) binary fission followed by cytokinesis. C) plasmolysis followed by karyotyping. D) plasmogamy followed by karyogamy. E) sporogenesis followed by gametogenesis.
plasmogamy followed by karyogamy.
24) For mycelia described as heterokaryons or as being dikaryotic, which process has already occurred, and which process has not yet occurred? A) germination, plasmogamy B) karyogamy, germination C) meiosis, mitosis D) germination, mitosis E) plasmogamy, genetic recombination
plasmogamy, genetic recombination
9) In septate fungi, what structures allow cytoplasmic streaming to distribute needed nutrients, synthesized compounds, and organelles throughout the hyphae? A) multiple chitinous layers in cross walls B) pores in cross walls C) complex microtubular cytoskeletons D) two nuclei E) tight junctions that form in cross walls between cells
pores in cross walls
3) If all fungi in an environment that perform decomposition were to suddenly die, then which group of organisms should benefit most, due to the fact that their fungal competitors have been removed? A) plants B) protists C) prokaryotes D) animals E) mutualistic fungi
prokaryotes
31) Which of the following produce the dense glassy ooze found in certain areas of the deep-ocean floor? A) forams B) dinoflagellates C) radiolarians D) ciliates E) apicomplexans
radiolarians
30) Thread-like pseudopods that can perform phagocytosis are generally characteristic of which group? A) radiolarians and forams B) gymnamoebas C) entamoebas D) amoeboid stage of cellular slime molds E) oomycetes
radiolarians and forams
10) What accounts most directly for the extremely fast growth of a fungal mycelium? A) rapid distribution of synthesized proteins by cytoplasmic streaming B) a long tubular body shape C) the readily available nutrients from their ingestive mode of nutrition D) a dikaryotic condition that supplies greater amounts of proteins and nutrients
rapid distribution of synthesized proteins by cytoplasmic streaming
3) Which group is incorrectly paired with its description? A) rhizarians-morphologically diverse group defined by DNA similarities B) diatoms-important producers in aquatic communities C) red algae-acquired plastids by secondary endosymbiosis D) apicomplexans-parasites with intricate life cycles E) diplomonads-protists with modified mitochondria
red algae-acquired plastids by secondary endosymbiosis
74) Both fungus-derived antibiotics and hallucinogens used by humans probably evolved in fungi as a means to A) reduce competition for nutrients. B) help humanity survive. C) promote their ingestion of foodstuffs. D) eliminate other fungi. E) discourage animal predators.
reduce competition for nutrients.
16) In most fungi, karyogamy does not immediately follow plasmogamy, which consequently A) means that sexual reproduction can occur in specialized structures. B) results in multiple diploid nuclei per cell. C) allows fungi to reproduce asexually most of the time. D) results in heterokaryotic or dikaryotic cells. E) is strong support for the claim that fungi are not truly eukaryotic.
results in heterokaryotic or dikaryotic cells.
1) Plastids that are surrounded by more than two membranes are evidence of A) evolution from mitochondria. B) fusion of plastids. C) origin of the plastids from archaea. D) secondary endosymbiosis. E) budding of the plastids from the nuclear envelope.
secondary endosymbiosis.
42) The ascomycetes get their name from which aspect of their life cycle? A) vegetative growth form B) asexual spore production C) sexual structures D) shape of the spore E) type of vegetative mycelium
sexual structures
59) In which of these human mycoses should one expect to find a growth pattern most similar to that of the mycelium that produced the fairy ring? A) skin mycoses B) coccidiomycosis (lung infection) C) systemic (blood-borne) Candida infection D) Sporothrix infection of lymphatic vessels E) Tinea tonsurans infection limited to interior of hair shafts
skin mycoses
63) Lichens sometimes reproduce asexually using A) coenocytic fungal hyphae located within photosynthetic cells. B) the fruiting bodies of fungi. C) flagellated, conjoined spores of both the fungus and alga. D) specialized conidiophores. E) small clusters of fungal hyphae surrounding photosynthetic cells.
small clusters of fungal hyphae surrounding photosynthetic cells.
75) A billionaire buys a sterile volcanic island that recently emerged from the sea. To speed the arrival of conditions necessary for plant growth, the billionaire might be advised to aerially sow what over the island? A) basiodiospores B) spores of ectomycorrhizae C) soredia D) yeasts E) leaves (as food for fungus-farming ants)
soredia
38) You have been given the assignment of locating living members of the phylum Glomeromycota. Where is the best place to look for these fungi? A) between the toes of a person with ʺathleteʹs footʺ B) in stagnant freshwater ponds C) the roots of vascular plants D) growing on rocks and tree bark E) the kidneys of mammals
the roots of vascular plants
60) If the fungus that produced the fairy ring can also produce arbuscules, then which of the following is most likely to be buried at location ʺCʺ? A) septic tank B) tree stump C) deceased animal D) fire pit E) cement-capped well
tree stump
43) Which pair of alternatives is highlighted by the life cycle of the cellular slime molds, such as Dictyostelium? A) prokaryotic or eukaryotic B) plant or animal C) unicellular or multicellular D) diploid or haploid E) autotroph or heterotroph
unicellular or multicellular
28) Using dead diatoms to ʺpumpʺ CO2 to the seafloor is feasible only if dead diatoms sink quickly. Consequently, application of mineral fertilizers, such as iron, should be most effective at times when diatom A) valves are thickest, and laminarin is being produced rather than oil. B) valves are thickest, and oil is being produced rather than laminarin. C) valves are thinnest, and laminarin is being produced rather than oil. D) valves are thinnest, and oil is being produced rather than laminarin.
valves are thickest, and laminarin is being produced rather than oil.
64) In both lichens and mycorrhizae, what does the fungal partner provide to its photosynthetic partner? A) carbohydrates B) fixed nitrogen C) antibiotics D) water and minerals E) protection from harmful UV
water and minerals
41) The gray-black, filamentous, haploid mycelium growing on bread is most likely what kind of organism? A) chytrid B) ascomycete C) basidiomycete D) deuteromycete E) zygomycete
zygomycete
11) Which two structures play direct roles in permitting bacteria to adhere to each other, or to other surfaces? 1. capsules 2. endospores 3. fimbriae 4. plasmids 5. flagella A) 1 and 2 B) 1 and 3 C) 2 and 3 D) 3 and 4 E) 3 and 5
1 and 3
11) Which two genera have members that can evade the human immune system by frequently changing their surface proteins? 1. Plasmodium 2. Trichomonas 3. Paramecium 4. Trypanosoma 5. Entamoeba A) 1 and 2 B) 1 and 4 C) 2 and 3 D) 2 and 4 E) 4 and 5
1 and 4
53) Nitrogenase, the enzyme that catalyzes nitrogen fixation, is inhibited whenever free O2 reaches a critical concentration. Consequently, nitrogen fixation cannot occur in cells wherein photosynthesis produces free O2. Consider the colonial aquatic cyanobacterium, Anabaena, whose heterocytes are described as having ʺ...a thickened cell wall that restricts entry of O2 produced by neighboring cells. Intracellular connections allow heterocytes to transport fixed nitrogen to neighboring cells in exchange for carbohydrates.ʺ Which two questions below arise from a careful reading of this quotation, and are most important for understanding how N2 enters heterocytes, and how O2 is kept out of heterocytes? 1. If carbohydrates can enter the heterocytes from neighboring cells via the ʺintracellular connections,ʺ how is it that O2 doesnʹt also enter via this route? 2. If the cell walls of Anabaenaʹs photosynthetic cells are permeable to O2 and CO2, are they also permeable to N2? 3. If the nuclei of the photosynthetic cells contain the genes that code for nitrogen fixation, how can these cells fail to perform nitrogen fixation? 4. If the nuclei of the heterocytes contain the genes that code for photosynthesis, how can these cells fail to perform photosynthesis? 5. If the cell walls of Anabaenaʹs heterocytes are permeable to N2, how is it that N2 doesnʹt diffuse out of the heterocytes before it can be fixed? 6. If the thick cell walls of the heterocytes exclude entry of oxygen gas, how is it that they donʹt also exclude the entry of nitrogen gas? A) 3 and 4 B) 2 and 5 C) 1 and 3 D) 4 and 6 E) 1 and 6
1 and 6
64) The termite gut protist, Mixotricha paradoxa, has at least two kinds of bacteria attached to its outer surface. One kind is a spirochete that propels its host through the termite gut. A second type of bacteria synthesizes ATP, some of which is used by the spirochetes. The locomotion provided by the spirochetes introduces the ATP-producing bacteria to new food sources. Which term(s) is (are) applicable to the relationship between the two kinds of bacteria? 1. mutualism 2. parasitism 3. symbiosis 4. metabolic cooperation A) 1 only B) 1 and 2 C) 2 and 3 D) 1, 3, and 4 E) all four terms
1, 3, and 4
10) In a bacterium that possesses antibiotic resistance and the potential to persist through very adverse conditions, such as freezing, drying, or high temperatures, DNA should be located within, or be part of, which structures? 1. nucleoid region 2. flagellum 3. endospore 4. fimbriae 5. plasmids A) 1 only B) 1 and 4 C) 1 and 5 D) 1, 3, and 5 E) 2, 4, and 5
1, 3, and 5
37) Which two processes are responsible for the shape of the curve at Time B? 1. transduction 2. entry of single-stranded Hfr DNA 3. rolling circle replication of single-stranded Hfr DNA 4. activation of DNA pumps in plasma membrane 5. ʺtoilet paperʺ replication of recipient cellʹs plasmids A) 1 and 4 B) 2 and 3 C) 3 and 5 D) 1 and 3 E) 4 and 5
2 and 3
1. autotroph 2. heterotroph 3. phototroph 4. chemotroph 41) a prokaryote that obtains both energy and carbon as it decomposes dead organisms A) 1 only B) 4 only C) 1 and 3 D) 2 and 4 E) 1, 3, and 4
2 and 4
63) A fish that had been salt-cured subsequently develops a reddish color. You suspect that the fish has been contaminated by the extreme halophile, Halobacterium. Which of these features of cells removed from the surface of the fish, if confirmed, would support your suspicion? 1. the presence of the same photosynthetic pigments found in cyanobacteria 2. cell walls that lack peptidoglycan 3. cells that are isotonic to conditions on the surface of the fish 4. its cells contain bacteriorhodopsin 5. the presence of very large numbers of ion pumps in its plasma membrane A) 2 and 5 B) 3 and 4 C) 1, 4, and 5 D) 3, 4, and 5 E) 2, 3, 4, and 5
2, 3, 4, and 5
67) In a hypothetical situation, a bacterium lives on the surface of a leaf, where it obtains nutrition from the leafʹs nonliving, waxy covering, while inhibiting the growth of other microbes that are plant pathogens. If this bacterium gains access to the inside of a leaf, it causes a fatal disease in the plant. Once the plant dies, the bacterium and its offspring decompose the plant. What is the correct sequence of ecological roles played by the bacterium in the situation described here? Use only those that apply. 1. nutrient recycler 2. mutualist 3. commensal 4. parasite 5. primary producer A) 1, 3, 4 B) 2, 3, 4 C) 2, 4, 1 D) 1, 2, 5 E) 1, 2, 3
2, 4, 1
62) The thermoacidophile, Sulfolobus acidocaldarius lacks peptidoglycan. What is likely to be true of this species? 1. It is a bacterium. 2. It is an archaean. 3. The optimal pH of its enzymes will lie above pH 7. 4. The optimal pH of its enzymes will lie below pH 7. 5. It could inhabit certain hydrothermal springs. 6. It could inhabit alkaline hot springs. A) 1, 3, and 6 B) 2, 4, and 6 C) 2, 4, and 5 D) 1, 3, and 5 E) 1, 4, and 5
2, 4, and 5
33) Among the six statements below, which two best account for the results obtained by the researchers (see Figure 27.1)? 1. Low-glucose conditions caused mutations that made individual E. coli cells better suited to these conditions. 2. Daughter cells acquired the ability to tolerate low-glucose conditions as they received the enzymes and membrane components that had been modified by their mother cell. 3. The initial E. coli population may have included some cells whose genes favored their survival in low-glucose conditions-OR-such genetic variants arose by chance early in the experiment. 4. The first few generations of E. coli in low-glucose conditions responded to the challenge by increasing the use of certain enzymes and ion pumps, while decreasing the use of others. This behavior was recorded in their gene sequences, which were later transmitted to daughter cells. 5. From generation to generation, there was an increase in the proportion of the experimental populations adapted to low-glucose conditions, because such bacteria produced relatively more offspring than did ancestral bacteria under low-glucose conditions. 6. During each generation, individual cells evolved to increase their survival in low-glucose conditions. A) 3 and 5 B) 1 and 5 C) 2 and 4 D) 1 and 6 E) 1 and 3
3 and 5
52) Given that the enzymes that catalyze nitrogen fixation are inhibited by oxygen, what are two ʺstrategiesʺ that nitrogen-fixing prokaryotes might use to protect these enzymes from oxygen? 1. couple them with photosystem II (the photosystem that splits water molecules) 2. package them in membranes that are impermeable to all gases 3. be obligate anaerobes 4. be strict aerobes 5. package these enzymes in specialized cells or compartments that inhibit oxygen entry A) 1 and 4 B) 2 and 4 C) 2 and 5 D) 3 and 4 E) 3 and 5
3 and 5
1. autotroph 2. heterotroph 3. phototroph 4. chemotroph 40) an organism that obtains its energy from chemicals A) 1 only B) 2 only C) 3 only D) 4 only E) 1 and 4
4 only
7) The predatory bacterium, Bdellovibrio bacteriophorus, drills into a prey bacterium and, once inside, digests it. In an attack upon a gram-negative bacterium that has a slimy cell covering which can inhibit phagocytosis, what is the correct sequence of structures penetrated by B. bacteriophorus on its way to the preyʹs cytoplasm? 1. membrane composed mostly of lipopolysaccharide 2. membrane composed mostly of phospholipids 3. peptidoglycan 4. capsule A) 2 → 4 → 3 →1 B) 1 → 3 → 4 → 2 C) 1 → 4 → 3 → 2 D) 4 → 1 → 3 → 2 E) 4 → 3 → 1 → 2
4132
61) Consider the thermoacidophile, Sulfolobus acidocaldarius. Which graph most accurately depicts the expected temperature and pH profiles of its enzymes? (NOTE: the horizontal axes of these graphs are double, with pH above, and temperature below.)
A (curves do not overlap)
68) How can prokaryotes be considered to be more successful on Earth than humans? A) Prokaryotes are much more numerous and have more biomass. B) Prokaryotes occupy more diverse habitats. C) Prokaryotes are more diverse in metabolism. D) Only B and C are correct. E) A, B, and C are correct.
A, B, and C are correct
51) Only certain prokaryotes can perform nitrogen fixation, but nitrogen-fixing prokaryotes are not known to live inside animals. Thus, how do animals gain access to fixed nitrogen? A) They may breathe it in from air that has experienced lightning discharges. B) They may ingest nitrogen fixers. C) They may ingest plants that harbor nitrogen fixers, or plants that absorbed fixed nitrogen from the soil. D) They may ingest other animals that had done either (B) or (C) above. E) Answers (B), (C), and (D) above are all possible.
Answers (B), (C), and (D) above are all possible.
23) Which of the following contains a copy of the chromosome, along with a small amount of dehydrated cytoplasm, within a tough wall? A) Endospore B) Sex pilus C) Flagellum D) Cell wall E) Capsule
Endospore
21) Which of the following is an important source of endotoxin in gram-negative species? A) Endospore B) Sex pilus C) Flagellum D) Cell wall E) Capsule
Cell wall
4) Which statement about bacterial cell walls is false? A) Bacterial cell walls differ in molecular composition from plant cell walls. B) Cell walls prevent cells from bursting in hypotonic environments. C) Cell walls prevent cells from dying in hypertonic conditions. D) Bacterial cell walls are similar in function to the cell walls of many protists, fungi, and plants. E) Cell walls provide the cell with a degree of physical protection from the environment.
Cell walls prevent cells from dying in hypertonic conditions.
69) Foods can be preserved in many ways by slowing or preventing bacterial growth. Which of these methods would not generally inhibit bacterial growth? A) Refrigeration: Slows bacterial metabolism and growth. B) Closing previously opened containers: Prevents more bacteria from entering, and excludes O2. C) Pickling: Creates a pH at which most bacterial enzymes cannot function. D) Canning in heavy sugar syrup: Creates osmotic conditions that remove water from most bacterial cells. E) Irradiation: Kills bacteria by mutating their DNA to such an extent that their DNA-repair enzymes are overwhelmed.
Closing previously opened containers: Prevents more bacteria from entering, and excludes O2.
16) Which group includes members that are important primary producers in ocean food webs, causes red tides that kill many fish, and may even be carnivorous? A) Ciliates B) Apicomplexans C) Dinoflagellates D) Brown algae E) Golden algae
Dinoflagellates
54) The data were collected from the heterocytes of a nitrogen-fixing cyanobacterium inhabiting equatorial ponds. Study the graph below and choose the most likely explanation for the shape of the curve. A) Enough O2 enters heterocytes during hours of peak photosynthesis to have a somewhat-inhibitory affect on nitrogen fixation. B) Light-dependent reaction rates must be highest between 1800 hours and 0600 hours. C) Atmospheric N2 levels increase at night because plants are no longer metabolizing this gas, so are not absorbing this gas through their stomata. D) Heterocyte walls become less permeable to N2 influx during darkness. E) The amount of fixed nitrogen that is dissolved in the pond water in which the cyanobacteria are growing peaks at the close of the photosynthetic day (1800 h).
Enough O2 enters heterocytes during hours of peak photosynthesis to have a somewhat-inhibitory affect on nitrogen fixation.
31) E. coli cells typically make most of their ATP by metabolizing glucose. Under the conditions of this experiment, what should be true of E. coliʹs generation time (especially early in the course of the experiment, but less so later on)? A) Generation time should be the same as in the typical environment. B) Generation time should be faster than in the typical environment. C) Generation time should be slower than in the typical environment. D) It is theoretically impossible to make any predictions about generation time, under these conditions.
Generation time should be slower than in the typical environment.
5) Which prokaryotic group is mismatched with its members? A) Proteobacteriadiverse gram-negative bacteria B) Gram-positive bacteriasymbionts in legume root nodules C) Spirocheteshelical heterotrophs D) Chlamydiasintracellular parasites E) Cyanobacteriasolitary and colonial photoautotrophs
Gram-positive bacteria- symbionts in legume root nodules
39) Which question, arising from the results depicted in Figure 27.2, is most interesting from a genetic perspective, and has the greatest potential to increase our knowledge base? A) If reciprocal crossing-over could occur even if the piece of donated Hfr DNA is identical to the homologous portion of the recipientʹs chromosome, what prevents this from occurring? B) Why do geneticists refer to the same structure by at least three different names: sex pilus, mating bridge, and conjugation tube? Why all the jargon? C) What forces are generally responsible for disrupting the mating bridge? D) How is it that a recipient cell does not necessarily become an Hfr cell as the result of conjugation with an Hfr cell? E) What makes a cell an ʺHfr cellʺ?
If reciprocal crossing-over could occur even if the piece of donated Hfr DNA is identical to the homologous portion of the recipientʹs chromosome, what prevents this from occurring?
20) Why is the filamentous morphology of the water molds considered a case of convergent evolution with the hyphae (threads) of fungi? A) Fungi are closely related to the water molds. B) Body shape reflects ancestor-descendant relationships among organisms. C) In both cases, filamentous shape is an adaptation for the absorptive nutritional mode of a decomposer. D) Filamentous body shape is evolutionarily ancestral for all eukaryotes. E) Both A and B are correct.
In both cases, filamentous shape is an adaptation for the absorptive nutritional mode of a decomposer.
8) An individual mixotroph loses its plastids, yet continues to survive. Which of the following most likely accounts for its continued survival? A) It relies on photosystems that float freely in its cytosol. B) It must have gained extra mitochondria when it lost its plastids. C) It engulfs organic material by phagocytosis or by absorption. D) It has an endospore. E) It is protected by a siliceous case.
It engulfs organic material by phagocytosis or by absorption.
36) How is the recipient cell different at Time D than it was at Time A? A) It has a greater number of genes. B) It has a greater mass of DNA. C) It has a different sequence of base pairs. D) It contains bacteriophage DNA. E) It has a greater number of introns.
It has a different sequence of base pairs.
12) Which statement regarding resistance is false? A) Many of the oomycetes that cause potato late blight have become resistant to pesticides. B) Many of the mosquitoes that transmit malaria to humans have become resistant to pesticides. C) Many of the malarial parasites have become resistant to antimalarial drugs. D) Many humans have become resistant to antimalarial drugs. E) Trichomonas vaginalis is resistant to the normal acidity of the human vagina.
Many humans have become resistant to antimalarial drugs.
3) Which of the following statements is not true? A) Archaea and bacteria have different membrane lipids. B) Both archaea and bacteria generally lack membrane-enclosed organelles. C) The cell walls of archaea lack peptidoglycan. D) Only bacteria have histones associated with DNA. E) Only some archaea use CO2 to oxidize H2, releasing methane.
Only bacteria have histones associated with DNA.
70) Many physicians administer antibiotics to patients at the first sign of any disease symptoms. Why can this practice cause more problems for these patients, and for others not yet infected? A) The antibiotic administered may kill viruses that had been keeping the bacteria in check. B) Antibiotics may cause other side effects in patients. C) Overuse of antibiotics can select for antibiotic-resistant strains of bacteria. D) Particular patients may be allergic to the antibiotic. E) Antibiotics may interfere with the ability to identify the bacteria present.
Overuse of antibiotics can select for antibiotic-resistant strains of bacteria.
49) Which of the following are responsible for high levels of O2 in Earthʹs atmosphere? A) PhotoAutotrophs B) photoheterotrophs C) chemoautotrophs D) chemoheterotrophs that perform decomposition E) parasitic chemoheterotrophs
PhotoAutotrophs
46) Which of the following use light energy to synthesize organic compounds from CO2? A) Photoautotrophs B) Photoheterotrophs C) Chemoautotrophs D) Chemoheterotrophs that perform decomposition E) Parasitic chemoheterotrophs
Photoautotrophs
22) If this structure connects the cytoplasm of two bacteria, one of these cells may gain new genetic material: A) Endospore B) Sex pilus C) Flagellum D) Cell wall E) Capsule
Sex pilus
2) Biologists have long been aware that the defunct kingdom Protista is paraphyletic. Which of these statements is both true and consistent with this conclusion? A) Many species within this kingdom were once classified as monerans. B) Animals, plants, and fungi arose from different protist ancestors. C) The eukaryotic condition has evolved only once among the protists, and all eukaryotes are descendants of that first eukaryotic cell. D) Chloroplasts among various protists are similar to those found in prokaryotes. E) Some protists, all animals, and all fungi share a protist common ancestor, but these protists, animals, and fungi are currently assigned to three different kingdoms.
Some protists, all animals, and all fungi share a protist common ancestor, but these protists, animals, and fungi are currently assigned to three different kingdoms.
13) Prokaryotic ribosomes differ from those present in eukaryotic cytosol. Because of this, which of the following is correct? A) Some selective antibiotics can block protein synthesis of bacteria without effects on protein synthesis in the eukaryotic host. B) Eukaryotes did not evolve from prokaryotes. C) Translation can occur at the same time as transcription in eukaryotes but not in prokaryotes. D) Some antibiotics can block the synthesis of peptidoglycan in the walls of bacteria. E) Prokaryotes are able to use a much greater variety of molecules as food sources than can eukaryotes.
Some selective antibiotics can block protein synthesis of bacteria without effects on protein synthesis in the eukaryotic host.
57) Which statement about the domain Archaea is false? A) Genetic prospecting has recently revealed the existence of many previously unknown archean species. B) Some archaeans can reduce CO2 to methane. C) The genomes of archaeans are unique, containing no genes that originated within bacteria. D) Some archaeans can inhabit solutions that are nearly 30% salt. E) Some archaeans are adapted to waters with temperatures above the boiling point.
The genomes of archaeans are unique, containing no genes that originated within bacteria.
28) Which of these can be inferred from Figure 27.1? A) Most of the genetic change that permitted adaptation to the new, low-glucose environment occurred toward the conclusion of the experiment. B) Rates of mitosis increased over the course of the experiment. C) The highest rate of genetic change occurred during the first quarter of the experiment. D) After 5,000 generations, the bacteria were 100% more fit than the original, ancestral bacteria.
The highest rate of genetic change occurred during the first quarter of the experiment.
14) Which statement about the genomes of prokaryotes is correct? A) Prokaryotic genomes are diploid throughout most of the cell cycle. B) Prokaryotic chromosomes are sometimes called plasmids. C) Prokaryotic cells have multiple chromosomes, ʺpackedʺ with a relatively large amount of protein. D) The prokaryotic chromosome is not contained within a nucleus but, rather, is found at the nucleoid region. E) Prokaryotic genomes are composed of linear DNA (that is, DNA existing in the form of a line with two ends).
The prokaryotic chromosome is not contained within a nucleus but, rather, is found at the nucleoid region.
66) If all prokaryotes on Earth suddenly vanished, which of the following would be the most likely and most direct result? A) The number of organisms on Earth would decrease by 10—20%. B) Human populations would thrive in the absence of disease. C) Bacteriophage numbers would dramatically increase. D) The recycling of nutrients would be greatly reduced, at least initially. E) There would be no more pathogens on Earth.
The recycling of nutrients would be greatly reduced, at least initially.
2) Though plants, fungi, and prokaryotes all have cell walls, we place them in different taxa. Which of these observations comes closest to explaining the basis for placing these organisms in different taxa, well before relevant data from molecular systematics became available? A) Some closely resemble animals, which lack cell walls. B) Their cell walls are composed of very different biochemicals. C) Some have cell walls only for support. D) Some have cell walls only for protection from herbivores. E) Some have cell walls only to control osmotic balance.
Their cell walls are composed of very different biochemicals.
15) Which of these statements about dinoflagellates is false? A) They possess two flagella. B) Some cause red tides. C) Their walls are composed of cellulose plates. D) Many types contain chlorophyll. E) Their dead cells accumulate on the seafloor, and are mined to serve as a filtering material.
Their dead cells accumulate on the seafloor, and are mined to serve as a filtering material.
1) Mycoplasmas are bacteria that lack cell walls. On the basis of this structural feature, which statement concerning mycoplasmas should be true? A) They are gram-negative. B) They are subject to lysis in hypotonic conditions. C) They lack a cell membrane as well. D) They undergo ready fossilization in sedimentary rock. E) They possess typical prokaryotic flagella.
They are subject to lysis in hypotonic conditions
18) Which of the following is not characteristic of ciliates? A) They use cilia as locomotory structures or as feeding structures. B) They are relatively complex cells. C) They can exchange genetic material with other ciliates by the process of mitosis. D) Most live as solitary cells in fresh water. E) They have two or more nuclei.
They can exchange genetic material with other ciliates by the process of mitosis
25) Which of these statements about prokaryotes is correct? A) Bacterial cells conjugate to mutually exchange genetic material. B) Their genetic material is confined within a nuclear envelope. C) They divide by binary fission, without mitosis or meiosis. D) The persistence of bacteria throughout evolutionary time is due to their genetic homogeneity (i.e., sameness). E) Genetic variation in bacteria is not known to occur, nor should it occur, because of their asexual mode of reproduction.
They divide by binary fission, without mitosis or meiosis.
72) Which statement about gram-negative bacteria is correct? A) Penicillins are the best antibiotics to use against them. B) They often possess an outer membrane containing toxic lipopolysaccharides. C) Their chromosomes are composed of DNA tightly wrapped around large amounts of histone proteins. D) Their cell walls are primarily composed of peptidoglycan.
They often possess an outer membrane containing toxic lipopolysaccharides.
30) If new genetic variation in the experimental populations arose solely by spontaneous mutations, then the most effective process for subsequently increasing the prevalence of the beneficial mutations in the population over the course of generations is A) transduction. B) binary fission. C) conjugation. D) transformation. E) meiosis.
binary fission.
4) Which of the following features of prokaryotic biology involves metabolic cooperation among cells? A) binary fission B) endospore formation C) endotoxin release D) biofilms E) photoautotrophy
biofilms
65) What is the primary ecological role of prokaryotes? A) parasitizing eukaryotes, thus causing diseases B) breaking down organic matter C) metabolizing materials in extreme environments D) adding methane to the atmosphere E) serving as primary producers in terrestrial environments
breaking down organic matter
5) Which of these statements is false and therefore does not support the hypothesis that certain eukaryotic organelles originated as bacterial endosymbionts? Such organelles A) are roughly the same size as bacteria. B) can be cultured on agar, because they make all their own proteins. C) contain circular DNA molecules. D) have ribosomes that are similar to those of bacteria. E) have internal membranes that contain proteins homologous to those of bacterial plasma membranes.
can be cultured on agar, because they make all their own proteins.
18) Not present in all bacteria, this cell covering enables cells that possess it to resist the defenses of host organisms: A) endospore B) sex pilus C) flagellum D) cell wall E) capsule
capsule
16) Which of the following is composed almost entirely of peptidoglycan? A) endospore B) sex pilus C) flagellum D) cell wall E) capsule
cell wall
47) Which of the following obtain energy by oxidizing inorganic substances; energy that is used, in part, to fix CO2? A) photoautotrophs B) photoheterotrophs C) chemoautotrophs D) chemoheterotrophs that perform decomposition E) parasitic chemoheterotrophs
chemoautotrophs
9) Which of these was not derived from an ancestral alpha proteobacterium? A) chloroplast B) mitochondrion C) hydrogenosome D) mitosome E) kinetoplast
chloroplast
17) You are given an unknown organism to identify. It is unicellular and heterotrophic. It is motile, using many short extensions of the cytoplasm, each featuring the 9+2 filament pattern. It has well-developed organelles and three nuclei, one large and two small. This organism is most likely to be a member of which group? A) foraminiferans B) radiolarians C) ciliates D) kinetoplastids E) slime molds
ciliates
14) Which of the following pairs of protists and their characteristics is mismatched? A) apicomplexans : internal parasites B) golden algae : planktonic producers C) euglenozoans : unicellular flagellates D) ciliates : red tide organisms E) entamoebas : ingestive heterotrophs
ciliates : red tide organisms
19) Which process results in genetic recombination, but is separate from the process wherein the population size of Paramecium increases? A) budding B) meiotic division C) mitotic division D) conjugation E) binary fission
conjugation
7) Which organisms represent the common ancestor of all photosynthetic plastids found in eukaryotes? A) autotrophic euglenids B) diatoms C) dinoflagellates D) red algae E) cyanobacteria
cyanobacteria
6) Plant-like photosynthesis that releases O2 occurs in A) cyanobacteria. B) chlamydias. C) archaea. D) actinomycetes. E) chemoautotrophic bacteria.
cyanobacteria.
71) Broad-spectrum antibiotics inhibit the growth of most intestinal bacteria. Consequently, assuming that nothing is done to counter the reduction of intestinal bacteria, a hospital patient who is receiving broad-spectrum antibiotics is most likely to become A) unable to fix carbon dioxide. B) antibiotic resistant. C) unable to fix nitrogen. D) unable to synthesize peptidoglycan. E) deficient in certain vitamins.
deficient in certain vitamins.
35) What is occurring at Time C that is decreasing the DNA content? A) crossing-over B) cytokinesis C) meiosis D) degradation of DNA that was not retained in the recipientʹs chromosome E) reversal of the direction of conjugation
degradation of DNA that was not retained in the recipientʹs chromosome
13) Which of these taxa contains species that produce potent toxins that can cause extensive fish kills, contaminate shellfish, and poison humans? A) red algae B) dinoflagellates C) diplomonads D) euglenids E) golden algae
dinoflagellates
38) During which two times can the recipient accurately be described as ʺrecombinantʺ due to the sequence of events portrayed in Figure 27.2? A) during Times C and D B) during Times A and C C) during Times B and C D) during Times A and B E) during Times B and D
during Times C and D
19) Not present in all bacteria, this structure enables those that possess it to germinate after exposure to harsh conditions, such as boiling: A) endospore B) sex pilus C) flagellum D) cell wall E) capsule
endospore
60) Assuming that each of these possesses a cell wall, which prokaryotes should be expected to be most strongly resistant to plasmolysis in hypertonic environments? A) extreme halophiles B) extreme thermophiles C) methanogens D) cyanobacteria E) nitrogen-fixing bacteria that live in root nodules
extreme halophiles
4) According to the endosymbiotic theory of the origin of eukaryotic cells, how did mitochondria originate? A) from infoldings of the plasma membrane, coupled with mutations of genes for proteins in energy-transfer reactions B) from engulfed, originally free-living prokaryotes C) by secondary endosymbiosis D) from the nuclear envelope folding outward and forming mitochondrial membranes E) when a protoeukaryote engaged in a symbiotic relationship with a protobiont
from engulfed, originally free-living prokaryotes
56) Carl Woese and collaborators identified two major branches of prokaryotic evolution. What was the basis for dividing prokaryotes into two domains? A) microscopic examination of staining characteristics of the cell wall B) metabolic characteristics such as the production of methane gas C) metabolic characteristics such as chemoautotrophy and photosynthesis D) genetic characteristics such as ribosomal RNA sequences E) ecological characteristics such as the ability to survive in extreme environments
genetic characteristics such as ribosomal RNA sequences
6) Penicillin is an antibiotic that inhibits enzymes from catalyzing the synthesis of peptidoglycan, so which prokaryotes should be most vulnerable to inhibition by penicillin? A) mycoplasmas B) gram-positive bacteria C) archaea D) gram-negative bacteria E) endospore-bearing bacteria
gram-positive bacteria
50) Modes of obtaining nutrients, used by at least some bacteria, include all of the following except A) chemoautotrophy. B) photoautotrophy. C) heteroautotrophy. D) chemoheterotrophy. E) photoheterotrophy.
heteroautotrophy.
55) Mitochondria are thought to be the descendants of certain alpha -proteobacteria. They are, however, no longer able to lead independent lives because most genes originally present on their chromosome have moved to the nuclear genome. Which phenomenon accounts for the movement of these genes? A) horizontal gene transfer B) binary fission C) alternative gene splicing D) meiosis E) plasmolysis
horizontal gene transfer
6) Which process allowed the nucleomorphs of chlorarachniophytes to be first reduced, and then (in a few species) lost altogether, without the loss of any genetic information? A) conjugation B) horizontal gene transfer C) binary fission D) phagocytosis E) meiosis
horizontal gene transfer
27) If it occurs in the absence of any other type of adaptation listed here, which of these is least reasonable in terms of promoting bacterial survival over evolutionary time in a low-glucose environment? A) increased efficiency at transporting glucose into the cell from the environment B) increased ability to survive on simple sugars, other than glucose C) increased ability to synthesize glucose from amino acid precursors D) increased reliance on glycolytic enzymes E) increased sensitivity to, and ability to move toward, whatever glucose is present in its habitat
increased reliance on glycolytic enzymes
22) If one were to apply the most recent technique used to fight potato late blight to the fight against the malarial infection of humans, then one would A) increase the dosage of the least-expensive antimalarial drug administered to humans. B) increase the dosage of the most common pesticide used to kill Anopheles mosquitoes. C) introduce a predator of the malarial parasite into infected humans. D) use a ʺcocktailʺ of at least three different pesticides against Anopheles mosquitoes. E) insert genes from a Plasmodium-resistant strain of mosquito into Anopheles mosquitoes.
insert genes from a Plasmodium-resistant strain of mosquito into Anopheles mosquitoes
15) If a bacterium regenerates from an endospore that did not possess any of the plasmids that were contained in its original parent cell, the regenerated bacterium will probably A) lack antibiotic-resistant genes. B) lack a cell wall. C) lack a chromosome. D) lose base pairs from its chromosome. E) be unable to survive in its normal environment.
lack antibiotic-resistant genes.
2) Photoautotrophs use A) light as an energy source and CO2 as a carbon source. B) light as an energy source and methane as a carbon source. C) N2 as an energy source and CO2 as a carbon source. D) CO2 as both an energy source and a carbon source. E) H2S as an energy source and CO2 as a carbon source.
light as an energy source and CO2 as a carbon source.
1) Genetic variation in bacterial populations cannot result from A) transduction. B) transformation. C) conjugation. D) mutation. E) meiosis.
meiosis.
26) Which term best describes what has occurred among the experimental populations of cells over this 8-year period? A) microevolution B) speciation C) adaptive radiation D) sexual selection E) stabilizing selection
microevolution
3) The strongest evidence for the endosymbiotic origin of eukaryotic organelles is the similarity between extant prokaryotes and which of the following? A) nuclei and chloroplasts B) mitochondria and chloroplasts C) cilia and mitochondria D) mitochondria and nuclei E) mitochondria and cilia
mitochondria and chloroplasts
29) If the vertical axis of Figure 27.1 refers to ʺDarwinian fitness,ʺ then which of these is the most valid and accurate measure of fitness? A) number of daughter cells produced per mother cell per generation B) amount of ATP generated per cell per unit time C) average swimming speed of cells through the growth medium D) amount of glucose synthesized per unit time E) number of generations per unit time
number of generations per unit time
21) The Irish potato famine was caused by an organism that belongs to which group? A) ciliates B) oomycetes C) diatoms D) apicomplexans E) dinoflagellates
oomycetes
44) Which of the following are responsible for many human diseases? A) photoautotrophs B) photoheterotrophs C) chemoautotrophs D) chemoheterotrophs that perform decomposition E) parasitic chemoheterotrophs
parasitic chemoheterotrophs
5) Which of these is the most common compound in the cell walls of gram-positive bacteria? A) cellulose B) lipopolysaccharide C) lignin D) peptidoglycan E) protein
peptidoglycan
45) Cyanobacteria are A) photoautotrophs. B) photoheterotrophs. C) chemoautotrophs. D) chemoheterotrophs that perform decomposition. E) parasitic chemoheterotrophs.
photoautotrophs.
48) Which of the following use light energy to generate ATP, but do not release oxygen? A) photoautotrophs B) photoheterotrophs C) chemoautotrophs D) chemoheterotrophs that perform decomposition E) parasitic chemoheterotrophs
photoheterotrophs
3) Which is the bacterial structure that acts as a selective barrier, allowing nutrients to enter the cell and wastes to leave the cell? A) plasma membrane B) capsule C) cell wall D) nucleoid region E) pili
plasma membrane
34) Which term is least closely associated with the others? A) Hfr cells making use of a sex pilus B) rolling circle replication C) the ʺtoilet paperʺ model of replication D) conjugation involving an F factor E) recombination involving a bacteriophage
recombination involving a bacteriophage
10) A biologist discovers a new unicellullar organism that possesses more than two flagella and two small, but equal-sized, nuclei. The organism has reduced mitochondria (mitosomes), no chloroplasts, and is anaerobic. To which clade does this organism probably belong? A) monera B) the diplomonads C) the ciliates D) protista E) the euglenids
the diplomonads
9) In a hypothetical situation, the genes for sex pilus construction and for tetracycline resistance are located together on the same plasmid within a particular bacterium. If this bacterium readily performs conjugation involving a copy of this plasmid, then the result should be A) a transformed bacterium. B) the rapid spread of tetracycline resistance to other bacteria in that habitat. C) the subsequent loss of tetracycline resistance from this bacterium. D) the production of endospores among the bacteriumʹs progeny. E) the temporary possession by this bacterium of a completely diploid genome.
the rapid spread of tetracycline resistance to other bacteria in that habitat.
8) Jams, jellies, preserves, honey, and other foodstuffs with a high sugar content hardly ever become contaminated by bacteria, even when the food containers are left open at room temperature. This is because bacteria that encounter such an environment A) undergo death by plasmolysis. B) are unable to metabolize the glucose or fructose, and thus starve to death. C) undergo death by lysis. D) are obligate anaerobes. E) are unable to swim through these thick and viscous materials.
undergo death by plasmolysis.
32) If the experimental population of E. coli lacks an F factor or F plasmid, and if bacteriophage are excluded from the bacterial cultures, then which of these is a means by which beneficial mutations might be transmitted horizontally to other E. coli cells? A) via sex pili B) via transduction C) via conjugation D) via transformation E) both A and C above
via transformation
