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Maximum usable energy per mol of glucose metabolised will be generated during

1. aerobic respiration by germinating seeds
2. production of methanol by enteric bacteria
3. fermentation into ethanol by yeast
4. glycolysis in the skeletal muscle of a sprinter performing a hundred metre dash

Correct answer: aerobic respiration by germinating seeds

Solution

Aerobic respiration breaks glucose down completely to carbon dioxide and water, capturing the most energy as ATP. Fermentation and anaerobic glycolysis only partially oxidize glucose, so they yield much less usable energy per mole.

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