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Out of 38 ATP molecules produced per glucose, 32 ATP molecules are formed from NADH/FADH2 in

1. respiratory chain
2. Krebs cycle
3. oxidative decarboxylation
4. EMP

Correct answer: respiratory chain

Solution

Most ATP from glucose comes from oxidative phosphorylation, where NADH and FADH2 pass electrons through the electron transport system. This process occurs in the respiratory chain, which uses the released energy to synthesize ATP.

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