During eukaryotic aerobic cellular respiration, which specific stage generates the majority of ATP molecules via chemiosmosis?
Answer and explanation
Correct answer: B. Oxidative phosphorylation across the inner mitochondrial membrane
- Step 1: Evaluate ATP yields across aerobic respiration stages.
- Step 2: While glycolysis and the citric acid cycle produce 2 ATP each via substrate-level phosphorylation, the electron transport chain and ATP synthase generate approximately 26–28 ATP per glucose via oxidative phosphorylation.
Answer
Oxidative phosphorylation across the inner mitochondrial membrane.
Why not the others: Glycolysis produces only 2 net ATP; the citric acid cycle yields 2 ATP/GTP; pyruvate oxidation yields NADH but 0 direct ATP.
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