Which Statement Is True About Obligate Anaerobes?

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Which Statement Is True About Obligate Anaerobes?

A. They will use O2 if it is present, but can obtain energy by fermentation if needed. B. They obtain energy by oxidizing ferrous ions. C. They use O2 for cellular respiration and cannot grow without it. D. They live exclusively by cellular respiration or by anaerobic respiration. E. They are poisoned by O2.
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E. They are poisoned by O2. Some obligate anaerobes live exclusively by fermentation; others extract chemical energy by anaerobic respiration, in which substances other than O2 accept electrons at the "downhill" end of electron transport chains.
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