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How many ATP molecules could maximally be generated from one molecule of glucose, if the complete oxidation of one mole of glucose to CO₂ and H₂O yields 686 kcal and the useful chemical energy available in the high energy phosphate bond of one mole of ATP is 12 kcal?

1. Thirty
2. Fifty-seven
3. One
4. Two

Correct answer: Fifty-seven

Solution

The maximum number of ATP molecules is found by dividing the total usable energy released from complete glucose oxidation by the energy required to form one ATP. Since 686 kcal ÷ 12 kcal per ATP ≈ 57, the best answer is fifty-seven.

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