Exercise: Microbial Metabolism

Questions for: Microbial Metabolism

Radioisotopes are frequently used in the study of cells. Assume a culture of E. coli is grown in a culture medium containing radioactive phosphorous. At the end of 48 hours, it is expected to find the radioactive label located in
A:
enzymes
B:
RNA
C:
phospholipids
D:
all of these
Answer: D
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In an oxygenic photosynthesis, the green and the purple bacteria do not use which of the following one as an electron source?
A:
H2O
B:
H2
C:
H2S
D:
S (elemental sulphur)
Answer: A
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In the passive diffusion, solute molecules cross the membrane as a result of
A:
concentration difference
B:
pressure difference
C:
ionic difference
D:
all of these
Answer: A
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Which of the following groups contain(s) many unique coenzymes, such as coenzyme M and coenzyme F420?
A:
Sulfate-reducing bacteria
B:
Methanotrophs (methane-oxidizing microbes)
C:
Methanogens (methane-producing microbes)
D:
Acetogens (acetigens; acetate-producing microbes)
Answer: C
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During the carboxylation phase of the Calvin cycle, CO2 combines with
A:
ribulose 1,5 - bisphosphate
B:
phosphoglyceraldehyde
C:
pyruvic acid
D:
oxaloacetic acid
Answer: A
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