The number of CO₂, NADPH₂, and ATP molecules required to synthesize one maltose molecule from the output of the Calvin cycle is, respectively:
Correct answer: C. 12, 24, 36
- A. 3, 6, 9
- B. 6, 12, 18
- C. 12, 24, 36
- D. 24, 48, 72
Explanation
The synthesis of one glucose molecule via the Calvin cycle requires 6 CO₂, 12 NADPH₂, and 18 ATP molecules. Since maltose is composed of two glucose molecules, twice these values are needed: 24 CO₂, 48 NADPH₂, and 72 ATP molecules. Option A is incorrect because it only provides enough resources for half a glucose molecule. Option B is incorrect, as it accounts for only one glucose molecule. Option D is incorrect because it suggests the resources for four glucose molecules, which is more than necessary for one maltose molecule.
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Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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