Which stage of aerobic respiration produces the largest number of ATP molecules per glucose?
Correct answer: C. Oxidative phosphorylation in the electron transport chain
- A. Glycolysis
- B. The Krebs cycle
- C. Oxidative phosphorylation in the electron transport chain
- D. The conversion of pyruvate to acetyl CoA
Explanation
Glycolysis nets 2 ATP and the Krebs cycle 2 more directly, but the reoxidation of NADH and FADH2 by the electron transport chain yields about 32 to 34 ATP, the vast majority of the total. The other stages are minor contributors by comparison.
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About Cellular Respiration
Cellular respiration releases energy from glucose through glycolysis, the link reaction, the Krebs cycle and the electron transport chain, producing ATP. The pathway differs in oxygen availability: aerobic respiration uses oxygen and yields more ATP, while anaerobic respiration produces much less ATP and forms lactic acid in muscles or ethanol and carbon dioxide in yeast.
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