What does it mean to say that many prokaryotes are facultatively anaerobic?
AThey are killed at once by any exposure to oxygen
BThey can grow only where oxygen is fully absent
CThey can use light instead of sugar for energy
DThey can switch between aerobic respiration and fermentation
Answer & Solution
Correct answer: D. They can switch between aerobic respiration and fermentation
1. Many prokaryotes are described as facultatively anaerobic.
2. That means they can switch between aerobic respiration and fermentation.
3. Which route they take depends on the availability of oxygen.
4. Being killed by oxygen describes obligate anaerobes instead, which are the opposite case.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 7 "Cellular Respiration", section 7.5 Metabolism without Oxygen_
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