Microbiology exam 4 questions
Of the four groups of fungi, which form flagellated asexual and sexual spores
Chytridiomycetes
What are two genera of bacteria that form endospores?
Clostridium and bacillus
Which of the following produce oxygen as by-product of photosynthesis ?
Cyanobacteria, plants and algae
Which statements are true about cyanobacteria ? A) they perform oxygenic photosynthesis B) they use water as the reducing agent C) they use light as source of energy D) A,B. and C E) B and C only
D
Which type of protozoa are flagellated and lack mitochondria ?
Diplomonads
bread molds
Zygospores
Bacteria in aquatic environments have evolved various mechanisms to maximize nutrient acquistion and retention. Why?
Most aquatic environments lack a steady supply of nutrients
Which of the following bacteria can oxidize large amounts of ammonia - containing waste, consuming so much oxygen in the process that they can create hypoxic areas of water?
Nitrifying Bacteria
The extension of cytoplasm and cell wall of caulobacter sp. is called ____.
Prosthecate
which of the following bacteria can oxidize metal compounds exposed during strip mining of coal, dramatically lowering pH and leading to damaging acid run-off into the surrounding ecosystem?
Sulfur - oxidizing bacteria
Sulfur oxidizing bacteria like acidithiobacillus use ____ as their energy sources
Sulfur and Sulfate
Lichens is an association of
algae and fungus
The casual agent of whooping cough is a _______.
bacterium
what group of fungi produces mushrooms?
basidiomycetes
Mushrooms
basidiospores
Which of the following statements is false about purple sulfur and green sulfur bacteria ?
both deposit sulfur granules inside the cells
What are the asexual spores of ascomycetes
conidia
Which of the following are the dormant resting stages of Streptomyces sp.?
conidia
What is the resting heat sensitive cell for nitrogen fixation formed by Azotobacter sp.?
cyst
What mechanism to acquire and retain nutrients is present in bioluminecent bacteria?
derive nutrients from others
When nutrient level is low, Myxobacter sp. forms resting body called ______.
microcyst
in terms yeast, mold, and mushrooms refer to fungal _______.
morphology
The organism that use light as a source of energy and glucose as source of carbon are called _____.
photoheterotrophs
Theya are bacteria that use organic chemicals as carbon source and light as energy source
photoheterotrophs
Bakers yeast
sporangiospores
Asexual spores of zygomycetes are contained in _____.
sporangium
in chtridiomycetes,
sporophyte is the diploid multicellular stage and gametophyte is the haploid multicellular stage
Which of the following groups of microorganisms oxidize organic compounds and produce a product that smell like a rotten egg?
sulfur and sulfate reducing bacteria
Borrelia burgdorferi causes ____.
Lyme disease
Which of the following statements regarding protozoa is false? A) some protozoa lack mitochondria B) some protozoa contain chlorophyll C) some protozoa are parastic D) malaria is caused by a protozoan
B
All of the following are true about fungi execpt ______ . A) Some are saprophytes and some are parasites B) some are aerobes and some are faculative anaerobes C) some are prokaryotes and some are eukaryotes D) some are unicellular and some are multicellular
C
What is the carbon source of chemoautotrophs
CO2
Chlorophyll in purple sulfur bacteria is located in the ____
Cell membrane forming membrane vesicle or membranes stack
Below ar emicroorganims and their energy sources. Which is mismatched ? A) Nitrifiers - NO2 B) Hydrogen oxidizing bacteria - H2 C) phototrophs - light D) chemoheterotrophs - glucose E) none are mismatched
E
Which of the following are thrue about methanogens ? A) they oxidize hydrogen gas B) They reduce carbon dioxide C) they produce methane D) A and C E) A , B , and C F) B and C
E
It is a group of aerobic chemoheterotrophs that can use molecular oxygen as final electron acceptor but in the absence of oxygen, they can use fermentation or anaerobic respiration to generate ATP
Faculative anaerobes
What is meant by dimorphism in fungi ?
Fungi can grow as single cells or as filaments
Which of the following can be used by photoautotrophs (aerobes or anaerobes) as reducing agent?
H2S and H2O
What hyphae are used by parasitic fungi for absorption of nutrients?
Haustoria
How does Helicobacter pykori withstand stomach acidity ?
It has urease that breaks urea, the breakdown products neutralize the acidity
Which of the following describes photosynthesis by photoheterophs?
It uses hydrogen sulfide as a source of electrons
Which type of protozoa have at least one flagellum and a distinctive complex mass of DNA in their large single mitochondrian made of interlocking rings?
Kinetoplastids
how do rhizobia benefit plants ?
they convert N2 to ammonia
