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As compared to a C3 plant, how many additional molecules of ATP are needed for net production of one molecule of hexose sugar by C4 plants:

1. two
2. six
3. twelve
4. zero

Correct answer: twelve

Solution

C4 plants spend additional ATP to regenerate phosphoenolpyruvate after CO2 is initially fixed, on top of the ATP used in the Calvin cycle. For one hexose, this extra cost adds up to 12 ATP more than in C3 plants.

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