Discussion
Which of the homoacetogenic bacteria utilize H2 and CO2 during anaerobic digestion of feedstock ?
Answer: B
The homoacetogen is Acetobacterium woodii.
Homoacetogenic bacteria make acetate as their sole product. Acetobacterium woodii fixes H2 and CO2 into acetate through the Wood-Ljungdahl (acetyl-CoA) pathway, and in digesters it competes with methanogens for hydrogen while supplying acetate to the acetoclastic methanogens.
Methanosarcina mazei is a methanogenic archaeon, which makes methane rather than acetate. Pseudomonas carboxydovorans is an aerobic bacterium that oxidises carbon monoxide, and Escherichia coli is a facultative anaerobe that performs mixed-acid fermentation, not homoacetogenesis.
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