AP bio final multiple choice questions
11.Which of the following statements correctly describes any chemical reaction that has reached equilibrium? A) The concentrations of products and reactants are equal. B) The reaction is now irreversible. C) Both forward and reverse reactions have halted. D) The rates of the forward and reverse reactions are equal. E) No reactants remain.
d
13. Which of the following is present in a prokaryotic cell? 1) mitochondrion 2) ribosome 3) nuclear envelope 4) chloroplast 5) ER
1
20. Cyanide binds with at least one molecule involved in producing ATP. If a cell is exposed to cyanide, most of the cyanide would be found within the 1) mitochondria. 2) ribosomes. 3) peroxisomes. 4) lysosomes. 5) endoplasmic reticulum.
1
4. If a long-day plant has a critical night length of 9 hours, which 24-hour cycle would prevent flowering? 4 hours light/8 hours dark/4 hours light/8 hours dark 16 hours light/8 hours dark 15.5 hours light/8.5 hours dark 8 hours light/8 hours dark/light flash/8 hours dark 14 hours light/10 hours dark
14 hours light/10 hours dark
17. Which structure is not part of the endomembrane system? 1) nuclear envelope 2) chloroplast 3) Golgi apparatus 4) plasma membrane 5) ER
2
13. We can be sure that a mole of table sugar and a mole of vitamin C are equal in their 1) mass in daltons. 2) mass in grams. 3) number of molecules. 4) number of atoms. 5) volume.
3
14. Measurements show that the pH of a particular lake is 4.0. What is the hydrogen ion concentration of the lake? 1) 4.0 M 2) 10^-10 M 3) 10^-4 M 4) 10^4 M 5) 4%
3
15. A slice of pizza has 500 kcal. If we could burn the pizza and use all the heat to warm a 50-L container of cold water, what would be the approximate increase in the temperature of the water? (Note: A liter of cold water weighs about 1 kg.) 1) 50°C 2) 5°C 3) 10°C 4) 100°C 5) 1°C
3
21. Which cell would be best for studying lysosomes? 1) muscle cell 2) nerve cell 3) phagocytic white blood cell 4) leaf cell of a plant 5) bacterial cell
3
11. Which structure is common to plant and animal cells? 1) chloroplast 2) wall made of cellulose 3) central vacuole 4) mitochondrion 5) centriole
4
12. Many mammals control their body temperature by sweating. Which property of water is most directly responsible for the ability of sweat to lower body temperature? 1) water's change in density when it condenses 2) water's ability to dissolve molecules in the air 3) the release of heat by the formation of hydrogen bonds 4) the absorption of heat by the breaking of hydrogen bonds 5) water's high surface tension
4
19. Which structure-function pair is mismatched? 1) nucleolus; production of ribosomal subunits 2) lysosome; intracellular digestion 3) ribosome; protein synthesis 4) Golgi; protein trafficking 5) microtubule; muscle contraction
5
3. Which of the following categories includes all others in the list? Monosaccharide Disaccharide Starch Carbohydrate
Carbohydrate
76) Which of the following could qualify as a top-down control on a grassland community? A) limitation of plant biomass by rainfall amount B) influence of temperature on competition among plants C) influence of soil nutrients on the abundance of grasses versus wildflowers D) effect of grazing intensity by bison on plant species diversity E) effect of humidity on plant growth rates
D
70) The feeding relationships among the species in a community determine the community's A) secondary succession. B) ecological niche. C) species richness. D) species-area curve. E) trophic structure.
E
5. A plant mutant that shows normal gravitropic bending but does not store starch in its plastids would require a reevaluation of the role of ____________ in gravitropism. calcium differential growth light auxin Statoliths
Statoliths
6. A mineral diffeicncy is likely to affect older leaves ore than younger leaves id The mineral is a micronutrient The mieral is very mobile within the plant The mineral is required for chlorophyll snthesis The mineral is a macronutrient
The mieral is very mobile within the plant
4. Which of the following statements concerning unsaturated fats is true They are more common in animals than in plants They have double bonds in the carbon chains of their fatty acids They generally solidify at room temperature They contain more hydrogen than do saturated fats having the same number of carbon atoms
They have double bonds in the carbon chains of their fatty acids
5. Movement of ylem sap from roots to leaves Occurs througg the apoplast of the sieve tube elemts Usually depends on tention or negative pressure potential Depends on active transport Depends on the pumping of water though aquaporins
Usually depends on tention or negative pressure potential
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 C02 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.
a
2.Which of the following factors would tend to increase membrane fluidity? A) a greater proportion of unsaturated phospholipids B) a greater proportion of saturated phospholipids C) a lower temperature D) a relatively high protein content in the membrane E) a greater proportion of relatively large glycolipids compared with lipids having smaller molecular masses
a
5. The structural level of a protein least affected by a disruption in hydrogen bonding is the A) primary level. B) secondary level. C) tertiary level. D) quaternary level. E) All structural levels are equally affected. A) primary level.
a
6 Plantlike photosynthesis that releases O2 occurs in a. cyanobacteria. b. chlamydias c. archaead. d.actinomycetes. e. chemoautotrophic bacteria.
a
65) Which of the following is a consequence of biological magnification? A) Toxic chemicals in the environment pose greater risk to top-level predators than to primary consumers. B) Populations of top-level predators are generally smaller than populations of primary consumers. C) The biomass of producers in an ecosystem is generally higher than the biomass of primary consumers. D) Only a small portion of the energy captured by producers is transferred to consumers. E) The amount of biomass in the producer level of an ecosystem decreases if the producer turnover time increases.
a
65) Which process in the nephron is least selective? A) filtration B) reabsorption C) active transport D) secretion E) salt pumping by the loop of Henle
a
67) Of the following statements about protected areas that have been established to preserve biodiversity, which one is not correct? A) About 25% of Earth's land area is now protected. B) National parks are one of many types of protected areas. C) Most protected areas are too small to protect species. D) Management of a protected area should be coordinated with management of the land surrounding the area. E) It is especially important to protect biodiversity hot spots.
a
73) Which of the following is a direct result of depolarizing the presynaptic membrane of an axon terminal? A) Voltage-gated calcium channels in the membrane open. B) Synaptic vesicles fuse with the membrane. C) The postsynaptic cell produces an action potential. D) Ligand-gated channels open, allowing neurotransmitters to enter the synaptic cleft. E) An EPSP or IPSP is generated in the postsynaptic cell.
a
75) Which of the following is an adaptation that enhances the uptake of water and minerals by roots? A) mycorrhizae B) cavitation C) active uptake by vessel elements D) rhythmic contractions by cortical cells E) pumping through plasmodesmata
a
80) Which of the following would be considered an example of bioremediation? A) adding nitrogen-fixing microorganisms to a degraded ecosystem to increase nitrogen availability B) using a bulldozer to regrade a strip mine C) dredging a river bottom to remove contaminated sediments D) reconfiguring the channel of a river E) adding seeds of a chromium-accumulating plant to soil contaminated by chromium
a
81) Compared with a cell with few aquaporins in its membrane, a cell containing many aquaporins will A) have a faster rate of osmosis. B) have a lower water potential. C) have a higher water potential. D) have a faster rate of active transport. E) accumulate water by active transport.
a
A populations carrying capacity May change as environmental conditions change Can be accurately calculated using the logistic growth model Generally remains constant over time Increases as the per capita growth rate decreases
a
Natural selection should favor the highest proportion of juxtamedullary nephrons in which of the following species? A) a mouse species living in a desert B) a mouse species living in a temperate broadleaf forest C) a river otter D) a beaver E) a mouse species living in a tropical rain forest
a
1.The hormone that helps plants respond to drought is ethylene. abscisic acid. auxin. cytokinin. gibberellin.
abscisic acid.
2.Auxin enhances cell elongation in all of these ways except acid-induced denaturation of cell wall proteins. cell wall loosening. gene activation. increased activity of plasma membrane proton pumps. increased uptake of solutes
acid-induced denaturation of cell wall proteins.
1. In what way do the membranes of a eukaryotic cell vary? A) Phospholipids are found only in certain membranes. B) Certain proteins are unique to each membrane. C) Only certain membranes of the cell are selectively permeable. D) Only certain membranes are constructed from amphipathic molecules. E) Some membranes have hydrophobic surfaces exposed to the cytoplasm, while others have hydrophilic surfaces facing the cytoplasm.
b
10. Homeostasis typically relies on negative feedback because positive feedback A) requires a response but not a stimulus. B) drives processes to completion rather than to a balance point. C) involves one location rather than several across the body. D) acts within, but not beyond, a normal range. E) can decrease but not increase a variable.
b
11. Curare, a substance that blocks the acetylcholine receptors on skeletal muscles, will cause...? A) specific disruption of blood pressure and digestive funcions. B) muscle relaxtion. C) rapid muscle twitches. D) sustained muscle contraction (tetanus). E) no effect in the absence of acetylcholinesterase.
b
13. Lipid-soluble signaling molecules, such as testosterone, cross the membranes of all cells but affect only target cells because A. only target cells retain the appropriate DNA segments. B. intracellular receptors are present only in target cells. C. only target cells possess the cytosolic enzymes that transduce the testosterone. D. only in target cells is testosterone able to initiate the phosphorylation cascade leading to activated transcription factor. E. most cells lack the Y chromosome required.
b
21) The body tissue that consists largely of material located outside of cells is A) epithelial tissue B) connective tissue C) skeletal muscle D) nervous tissue
b
4. The inorganic nutrient most often lacjing in plants is Carbon B. nitrogen C. phosphorus D. potassium
b
6) Which structure or compartment is not part of the plant's apoplast? A) the lumen of a xylem vessel B) the lumen of a sieve tube C) the cell wall of a mesophyll cell D) the cell wall of a transfer cell E) the cell wall of a root hair
b
64) If you were to jog 1 km a few hours after lunch, which stored fuel would you probably tap? A) muscle proteins B) muscle and liver glycogen C) fat stored in the liver D) fat stored in adipose tissue E) blood proteins
b
65) According to Hamilton's rule, A) natural selection does not favor altruistic behavior that causes the death of the altruist. B) natural selection favors altruistic acts when the resulting benefit to the beneficiary, corrected for relatedness, exceeds the cost to the altruist. C) natural selection is more likely to favor altruistic behavior that benefits an offspring than altruistic behavior that benefits a sibling. D) the effects of kin selection are larger than the effects of direct natural selection on individuals. E) altruism is always reciprocal.
b
69) African lungfish, which are often found in small stagnant pools of fresh water, produce urea as a nitrogenous waste. What is the advantage of this adaptation? A) Urea takes less energy to synthesize than ammonia. B) Small stagnant pools do not provide enough water to dilute the toxic ammonia. C) The highly toxic urea makes the pool uninhabitable to potential competitors. D) Urea forms an insoluble precipitate. E) Urea makes lungfish tissue hypoosmotic to the pool.
b
72) Why are action potentials usually conducted in one direction? A) The nodes of Ranvier conduct potentials in one direction. B) The brief refractory period prevents reopening of voltage-gated Na+ channels. C) The axon hillock has a higher membrane potential than the terminals of the axon. D) Ions can flow along the axon in only one direction.
b
74. Suppose a particular neurotransmitter causes IPSP in postsynaptic cell X and EPSP in postsynaptic cell Y. A likely explanation is that: A. cells X and Y express different receptor molecules for this particular neurotransmitter. B. only cell Y produces an enzyme that terminates the activity of the neurotransmitter. C. the axon of cell X is myelinated, but that of cell Y is not. D. the threshold value in the postsynaptic membrane is different for cell X and cell Y
b
75) Which of these ecosystems has the lowest net primary production per square meter? A) a salt marsh B) an open ocean C) a coral reef D) a grassland E) a tropical rain forest
b
79) During the contraction of a vertebrate skeletal muscle fiber, calcium ions A) break cross-bridges by acting as a cofactor in the hydrolysis of ATP. B) bind with troponin, changing its shape so that the myosin-binding sites on actin are exposed. C) transmit action potentials from the motor neuron to the muscle fiber. D) spread action potentials through the T tubules. E) re-establish the polarization of the plasma membrane following an action potential.
b
94) Which of these is not part of insect immunity? A) enzyme activation of microbe-killing chemicals B) activation of natural killer cells C) phagocytosis by hemocytes D) production of antimicrobial peptides E) a protective exoskeleton
b
98) Which of the following should be the same in identical twins? A) the set of antibodies produced B) the set of MHC molecules produced C) the set of T cell antigen receptors produced D) the susceptibility to a particular virus E) the set of immune cells eliminated as self-reactive
b
99) Vaccination increases the number of A) different receptors that recognize a pathogen. B) lymphocytes with receptors that can bind to the pathogen. C) epitopes that the immune system can recognize. D) macrophages specific for a pathogen. E) MHC molecules that can present an antigen.
b
The reactivity of an atom arises from A) the average distance of the outermost electron shell from the nucleus. B) the existence of unpaired electrons in the valence shell. C) the sum of the potential energies of all the electron shells. D) the potential energy of the valence shell. E) the energy difference between the s and p orbitals.
b
1. the molecular formula for glucose is C6H12O6. what would be the molecular formula for a polymer made by linking ten glucose molecules together by dehydration reactions? A.C60 H120 O60 B.C6 H12 O6 C.C60 H102 O51 D.C60 H100 O50 E.C60 H111 O51
c
100) Which of the following would not help a virus avoid triggering an adaptive immune response? A) having frequent mutations in genes for surface proteins B) infecting cells that produce very few MHC molecules C) producing proteins very similar to those of other viruses D) infecting and killing helper T cells E) building the viral shell from host proteins
c
11.The atomic number of sulfur is 16. Sulfur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulfur atom, predict the molecular formula of the compound: A) HS B) HS₂ C) H₂S D) H₃S₂ E) H₄S
c
12. Although many chimpanzees live in environments containing oil palm nuts, members of only a few populations use stones to crack open the nuts. The likely explanation is that a. members of different populations differ in manual dexterity. b. members of different populations have different nutritional requirements. c. the cultural tradition of using stones to crack nuts has arisen in only some populations. d. members of different populations differ in learning ability. e. the behavioral difference is caused by genetic differences between populations.
c
48) Which of the following would increase the rate of heat exchange between an animal and its environment? A) feathers or fur B) vasoconstriction C) wind blowing across the body surface D) blubber or fat layer
c
48. According to the logistic growth equation The number of individuals added per unit time is greatest when N is close to zero The per capita growth rate r increases as N approaches K Population growth is zero when N equals K The population grows exponentially when K is small
c
60) The mammalian trachea and esophagus both connect to the A) large intestine. B) stomach. C) pharynx. D) rectum. E) epiglottis.
c
61) Which of the following organs is incorrectly paired with its function? A) stomach protein digestion B) oral cavity starch digestion C) large intestine bile production D) small intestine nutrient absorption E) pancreas enzyme production
c
66) Which of the following strategies would most rapidly increase the genetic diversity of a population in an extinction vortex? A) Capture all remaining individuals in the population for captive breeding followed by reintroduction to the wild. B) Establish a reserve that protects the population's habitat. C) Introduce new individuals transported from other populations of the same species. D) Sterilize the least fit individuals in the population. E) Control populations of the endangered population's predators and competitors.
c
68) What happens when a resting neuron's membrane depolarizes? A) There is a net diffusion of Na+ out of the cell. B) The equilibrium potential for K+ (EK) becomes more positive. C) The neuron's membrane voltage becomes more positive. D) The neuron is less likely to generate an action potential. E) The cell's inside is more negative than the outside.
c
69) A common feature of action potentials is that they A) cause the membrane to hyperpolarize and then depolarize. B) can undergo temporal and spatial summation. C) are triggered by a depolarization that reaches the threshold. D) move at the same speed along all axons. E) require the diffusion of Na+ and K+ through ligand-gated channels to propagate.
c
69) Fossilized stromatolites A) all date from 2.7 billion years ago. B) formed around deep-sea vents. C) resemble structures formed by bacterial communities that are found today in some warm, shallow, salty bays. D) provide evidence that plants moved onto land in the company of fungi around 500 million years ago. E) contain the first undisputed fossils of eukaryotes and date from 2.1 billion years ago.
c
70) Where are neurotransmitter receptors located? A) the nuclear membrane B) the nodes of Ranvier C) the postsynaptic membrane D) synaptic vesicle membranes E) the myelin sheath
c
72) Based on the intermediate disturbance hypothesis, a community's species diversity is increased by A) frequent massive disturbance. B) stable conditions with no disturbance. C) moderate levels of disturbance. D) human intervention to eliminate disturbance. E) intensive disturbance by humans.
c
73) If the direction of Earth's rotation reversed, the most predictable effect would be A) no more night and day. B) a big change in the length of the year. C) winds blowing from west to east along the equator. D) a loss of seasonal variation at high latitudes.
c
74) Which of the following organisms is incorrectly paired with its trophic level? A) cyano bacterium primary producer B) grass hopper primary consumer C) zooplankton primary producer D) eagle tertiary consumer E) fungus detritivore
c
78) Which of the following has the greatest effect on the rate of chemical cycling in an ecosystem? A) the ecosystem's rate of primary production B) the production efficiency of the ecosystem's consumers C) the rate of decomposition in the ecosystem D) the trophic efficiency of the ecosystem E) the location of the nutrient reservoirs in the ecosystem
c
80) A plant cell with a ΨS of -0.65 MPa maintains a constant volume when bathed in a solution that has a ΨS of -0.30 MPa and is in an open container. The cell has a A) ΨP of +0.65 MPa. B) Ψ of -0.65 MPa. C) ΨP of +0.35 MPa. D) ΨP of +0.30 MPa. E) Ψ of 0 MPa.
c
95) An epitope associates with which part of an antigen receptor or antibody? A) the disulfide bridge B) the heavy-chain constant regions only C) variable regions of a heavy chain and light chain combined D) the light-chain constant regions only E) the tail
c
96) Which statement best describes the difference in responses of effector B cells (plasma cells) and cytotoxic T cells? A) B cells confer active immunity; cytotoxic T cells confer passive immunity. B) B cells kill pathogens directly; cytotoxic T cells kill host cells. C) B cells secrete antibodies against a pathogen; cytotoxic T cells kill pathogen-infected host cells. D) B cells carry out the cell-mediated response; cytotoxic T cells carry out the humoral response. E) B cells respond the first time a pathogen is present; cytotoxic T cells respond subsequent times.
c
The binding of calcium to the troponin complex..? A) disrupts cross-bridges, allowing filaments to slide past each other. B) opens ion channels, allowing sodium to rush into the muscle cells. C) causes tropomyosin to shift position, exposing myosin bind sites to actin. D) allows tropomyosin to bind actin. E) activates myosin kinase, causing phosphorylation of myosin heads.
c
13. Which of the following is not required for a behavioral trait to evolve by natural selection? A.An individual's reproductive success depends in part on how the behavior is performed. B.An individual's genotype influences its behavioral phenotype. C.The behavior varies among individuals. D.In each individual, the form of the behavior is determined entirely by genes. E.Some component of the behavior is genetically inherited.
d
22. What is the most likely pathway taken by a newly synthesized protein that will be secreted by a cell? A) ER → Golgi → nucleus B) Golgi →ER →lysosome C) nucleus →ER →Golgi D) ER →Golgi →vesicles that fuse with plasma membrane E) ER →lysosomes →vesicles that fuse with plasma membrane
d
3 Which of the following statements is not true? a. Archaea and bacteria have different membrane lipids. b. Both archaea and bacteria generally lack membraneenclosed 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
d
3.Which of the following processes includes all others? A) osmosis B) diffusion of a solute across a membrane C) facilitated diffusion D) passive transport E) transport of an ion down its electrochemical gradient
d
62) One characteristic that distinguishes a population in an extinction vortex from most other populations is that A) its habitat is fragmented. B) it is a rare, top-level predator. C) its effective population size is much lower than its total population size. D) its genetic diversity is very low. E) it is not well adapted to edge conditions.
d
62) Which of the following is not a major activity of the stomach? A) mechanical digestion B) HCl secretion C) mucus secretion D) nutrient absorption E) enzyme secretion
d
63) After surgical removal of an infected gallbladder, a person must be especially careful to restrict dietary intake of A) starch. B) protein. C) sugar. D) fat. E) water.
d
63) The main cause of the increase in the amount of CO₂ in Earth's atmosphere over the past 150 years is A) increased worldwide primary production. B) increased worldwide standing crop. C) an increase in the amount of infrared radiation absorbed by the atmosphere. D) the burning of larger amounts of wood and fossil fuels. E) additional respiration by the rapidly growing human population.
d
64) Which of the following is true of innate behaviors? A) Their expression is only weakly influenced by genes. B) They occur with or without environmental stimuli. C) They are limited to invertebrate animals. D) They are expressed in most individuals in a population. E) They occur in invertebrates and some vertebrates but not mammals.
d
73) Which of the following steps has not yet been accomplished by scientists studying the origin of life? A) synthesis of small RNA polymers by ribozymes B) abiotic synthesis of polypeptides C) formation of molecular aggregates with selectively permeable membranes D) formation of protocells that use DNA to direct the polymerization of amino acids E) abiotic synthesis of organic molecules
d
76) The discipline that applies ecological principles to returning degraded ecosystems to a more natural state is known as A) population viability analysis. B) landscape ecology. C) conservation ecology. D) restoration ecology. E) resource conservation.
d
77) Nitrifying bacteria participate in the nitrogen cycle mainly by A) converting nitrogen gas to ammonia. B) releasing ammonium from organic compounds, thus returning it to the soil. C) converting ammonia to nitrogen gas, which returns to the atmosphere. D) converting ammonium to nitrate, which plants absorb.
d
97) Which of the following statements is not true? A) An antibody has more than one antigen-binding site. B) An antigen can have different epitopes. C) A pathogen makes more than one antigen. D) A lymphocyte has receptors for multiple different antigens. E) A liver cell makes one class of MHC molecule.
d
Which chemical group is most likely to be responsible for an organic molecule behaving as a base? A) hydroxyl B) carbonyl C) carboxyl D) amino E) phosphate
d
Which of the following hydrocarbons has a double bond in its carbon skeleton? A) C₃H₈ B) C₂H₆ C) CH₄ D) C₂H₄ E) C₂H₂
d
Which of the following is an accurate statement about thermoregulation? A) Endotherms are warm-blooded and ectotherms are cold-blooded. B) Endotherms maintain a constant body temperature and ectotherms do not. C) Endothermy has a lower energy cost than ectotherm D) Endotherms and ectotherms differ in their primary source of heat for thermoregulation. E) Endotherms are regulators and ectotherms are conformers.
d
.1 Genetic variation in bacterial populations cannot result from a. Transduction. d. mutation. b. Transformation. e. meiosis. c. conjugation.
e
11. What coefficients must be placed in the following blanks so that all atoms are accounted for in the products? C₆H₁₂O₆ → ____ C₂H₆O + ____ CO₂ A) 1; 2 B) 3; 1 C) 1; 3 D) 1; 1 E) 2; 2
e
64) What is the single greatest threat to biodiversity? A) overharvesting of commercially important species B) introduced species that compete with native species C) pollution of Earth's air, water, and soil D) disruption of trophic relationships as more and more prey species become extinct E) habitat alteration, fragmentation, and destruction
e
79) The Hubbard Brook watershed deforestation experiment yielded all of the following results except: A) Most minerals were recycled within a forest ecosystem. B) The flow of minerals out of a natural watershed was offset by minerals flowing in. C) Deforestation increased water runoff. D) The nitrate concentration in waters draining the deforested area became dangerously high. E) Calcium levels remained high in the soil of deforested areas.
e
79) What would enhance water uptake by a plant cell? A) decreasing the Ψ of the surrounding solution B) increasing the pressure exerted by the cell wall C) the loss of solutes from the cell D) increasing the Ψ of the cytoplasm E) positive pressure on the surrounding solution
e
81) If you applied a fungicide to a cornfield, what would you expect to happen to the rate of decomposition and net ecosystem production (NEP)? A) Both decomposition rate and NEP would decrease. B) Both decomposition rate and NEP would increase. C) Neither would change. D) Decomposition rate would increase and NEP would decrease. E) Decomposition rate would decrease and NEP would increase.
e
Bacteria perform the following ecological roles. Which role typically does not involve symbiosis. a) skin commensalist b) pathogen c) bioluminescent bacteria in fish d) gut mutualist e) decomposer
e
11. When climbing a mountain, we can observe transitions in biological communities that are analogous to the changes at different depths in the ocean. across the United States from east to west. in biomes at different latitudes. in a community through different seasons. in an ecosystem as it evolves over time. in biomes at different latitudes.
in biomes at different latitudes.
2.Charles and Francis Darwin discovered that auxin can pass through agar. light is perceived by the tips of coleoptiles. auxin is responsible for phototropic curvature. red light is most effective in shoot phototropism. light destroys auxin.
light is perceived by the tips of coleoptiles.
3.The signaling molecule for flowering might be released earlier than usual in a long-day plant exposed to flashes of far-red light during the day. red light during the day. red light followed by far-red light during the night. far-red light during the night. red light during the night.
red light during the night
10. Which of the following biomes is correctly paired with the description of its climate? tundra-long summers, mild winters tropical forests-nearly constant day length and temperature temperate grasslands-relatively warm winters, most rainfall in summer temperate broadleaf forest-relatively short growing season, mild winters savanna-low temperature, precipitation uniform during the year tropical forests-nearly constant day length and temperature
tropical forests-nearly constant day length and temperature