In the Calvin cycle, what are the roles of ATP and reduced NADP?
Answer and explanation
Correct answer: B. They supply energy and hydrogen to convert glycerate 3-phosphate (GP) to triose phosphate (TP)
- Step 1: The light-dependent stage produces ATP and reduced NADP.
- Step 2: In the Calvin cycle they reduce GP to TP; some TP regenerates RuBP and the rest forms sugars.
Answer
They supply energy and hydrogen to convert glycerate 3-phosphate (GP) to triose phosphate (TP).
Why not the others: They split water to release oxygen: water is split in the light-dependent stage by photolysis. They fix carbon dioxide onto RuBP: carbon fixation is catalysed by rubisco. They absorb light energy for photosystems: chlorophyll absorbs light.
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