alleryStart learning →Which part of glucose metabolism is the only one that uses atmospheric oxygen?
AThe electron transport chain
BGlycolysis in the cytoplasm
CThe oxidation of pyruvate
DThe citric acid cycle
Answer & Solution
Correct answer: A. The electron transport chain
1. The electron transport chain is the last component of aerobic respiration.
2. It is the only part of glucose metabolism that uses atmospheric oxygen.
3. Oxygen sits at the endpoint of the chain, where electrons reduce it to form water.
4. The citric acid cycle is called aerobic because it depends on this chain, not because it consumes oxygen itself.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 7 "Cellular Respiration", section 7.4 Oxidative Phosphorylation_
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