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Net gain of ATP molecules during aerobic respiration is

1. 36 molecules
2. 38 molecules
3. 40 molecules
4. 48 molecules

Correct answer: 38 molecules

Solution

In the classic textbook accounting, aerobic respiration of one glucose molecule yields 38 ATP in total. This total comes from ATP formed directly in glycolysis and the Krebs cycle plus the larger amount produced during oxidative phosphorylation.

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