Which of the following is NOT a potential reason anoxic methane-oxidizing Archaea have not also acquired the ability to reduce sulfate?
A) An individual electron acceptor such as sulfate is not always present where methane is.
B) Minimizing the metabolic requirements of the archaeon's genome size provides flexibility to interact with other reducing bacteria, such as nitrate reducers.
C) The archaeon-bacterium relationship yields more energy from methane oxidation/sulfate reduction when performed together than separately.
D) The methane-oxidizing Archaea will not easily acquire this metabolic capability from the bacterial partner.
Organisms that aerobically catabolize methane use the intermediate ________ for biosynthesis and produce ________ when oxidizing the substrate for energy.
A) CH2O (formaldehyde) / CO
B) CH2O (formaldehyde) / CO2
C) HCOO (formate) / CO
D) HCOO (formate) / CO2
The conversion of light into chemical energy is called photoautotrophy.
Indicate whether the statement is true or false.
What metabolism would be favored when there is a lack of electron acceptors?
A) anaerobic fermentation
B) anoxygenic photosynthesis
C) anoxic ammonia oxidation
D) acetogenesis
Methanogens that use methyl-CoM for biosynthesis use ________ as a substrate.
A) acetate
B) carbon monoxide
C) methane
D) methanol
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