alleryStart learning →Sulfate-reducing bacteria and Archaea regenerate their oxidized carrier by reducing sulfate to which product?
ATo sodium sulfite
BTo sulfur dioxide
CTo sulfuric acid
DTo hydrogen sulfide
Answer & Solution
Correct answer: D. To hydrogen sulfide
1. Sulfate-reducing bacteria and Archaea are mostly anaerobic organisms.
2. They reduce sulfate to hydrogen sulfide in order to regenerate the oxidized carrier from NADH.
3. These are the organisms whose hydrogen sulfide gas can turn coastal waters green as they decompose algae.
4. Sulfuric acid is an oxidised product, so it cannot be what a reduction reaction yields.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 7 "Cellular Respiration", section 7.5 Metabolism without Oxygen_
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