A. Some colon prokaryotes are able to generate methane using a different pathway

Question

A. Some colon prokaryotes are able to generate methane using a different pathway than anaerobic respiration. These prokaryotes can use which of the following pathways?

a. aerobic respiration

b. photosynthesis

c. autotrophic methanogenesis

B. The carbon source for the methane-producing pathway identified in your answer to the previous question is

a. hydrogen gas

b. elemental sulfur

c. carbon dioxide

d. glucose

C. The electron source for this methane (CH4) producing pathway is (hydrogen gas, elemental sulfur, carbon dioxide, or glucose), an (organic or inorganic) molecule, that is in a fully (reduced or oxidized) state in its role as an electron source.   

D. The electron acceptor for this methane-producing pathway is

a. glucose

b. carbon dioxide

c. elemental sulfur

d. hydrogen gas

Explanation / Answer

A.   c. autotrophic methanogenesis

These prokaryotes reduce carbon dioxide into methane in the presence of hydrogen. These methanogens produce methane as a metabolic byproduct in anoxic conditions (anaerobic conditions).

B.c. carbon dioxide

These prokaryotes reduce carbon dioxide into methane in the presence of hydrogen. These methanogens use CO2 as a source of carbon.

D. b. carbon dioxide

The electron source for this methane (CH4) producing pathway is carbon dioxide. Hydrogen gas acts as an electron acceptor in the reaction.

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