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Synthesis of each molecule of glucose in photosynthesis involves:

1. 18 molecules of ATP
2. 10 molecules of ATP
3. 8 molecules of ATP
4. 6 molecules of ATP

Correct answer: 18 molecules of ATP

Solution

Fixing 6 CO2 to make one glucose in the Calvin cycle consumes 18 molecules of ATP (and 12 NADPH). So the answer is 18 ATP.

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