Evolution Of Life Question 47
Question: Desulfovibrio is a bacterium that breaks down organic matter which it must have and uses sulphate not oxygen as an electron acceptor. As a result, it produces hydrogen sulphide ( $ H_2S $ ), accounting for the ‘rotten egg’ smell of swamp muck. Oxygen is a deadly poison to Desulfovibrio. We would call Desulfovibrio a(n):
Options:
A) facultatively anaerobic chemoautotroph.
B) obligately anaerobic chemoheterotroph.
C) facultatively aerobic chemoheterotroph.
D) obligately anaerobic chemoautotroph.
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Answer:
Correct Answer: B
Solution:
[b] Obligate anaerobes are poisoned by oxygen.
Chemoheterotrophs must consume organic molecules for both energy and carbon.
BETA
