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During which stage in the complete oxidation of glucose are the greatest number of ATP molecules formed from ADP?

1. glycolysis
2. krebs cycle
3. conversion of pyruvic acid to acetyl Co-A
4. electron transport chain

Correct answer: electron transport chain

Solution

The electron transport chain produces the greatest number of ATP molecules because it uses high-energy electrons to build a proton gradient that drives ATP synthase. The earlier stages make only small amounts of ATP directly.

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