The ATP generated from cellular respiration is not sufficient to drive the Calvin cycle in plants, even if appropriate levels of NADPH and CO2 are present. Why not?
A. Breaking down sugar to provide the energy needed to synthesize sugar would be a futile cycle.
B. Plants do not undergo cellular respiration.
C. Cellular respiration and photosynthesis do not happen in the same cells in plants.
D. The Calvin cycle requires more ATP than can possibly be made from cellular respiration.
Answer: A
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