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Out of 36 ATP molecules produced per glucose molecule during respiration

1. 2 are produced outside glycolysis and 34 during respiratory chain
2. 2 are produced outside mitochondria and 34 inside mitochondria
3. 2 during glycolysis and 34 during Krebs cycle
4. All are formed inside mitochondria

Correct answer: 2 are produced outside mitochondria and 34 inside mitochondria

Solution

Glycolysis occurs in the cytoplasm, so its 2 ATP are produced outside mitochondria. The remaining 34 ATP come from the mitochondrial stages of respiration, mainly the Krebs cycle and electron transport chain.

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