alleryNumber of ATP and NADPH consumed in Calvin cycle PER turn (per CO₂ fixed):
A1, 1
B12, 18
C3 ATP and 2 NADPH per CO₂ fixed
D6, 6
Answer & Solution
Correct answer: C. 3 ATP and 2 NADPH per CO₂ fixed
Per CO₂: 3 ATP (2 for reduction at GAP, 1 for regeneration of RuBP) + 2 NADPH (for reduction).
One round of Calvin cycle fixes 1 CO₂.
Need 6 rounds = 6 CO₂ to make 1 glucose.
**So 18 ATP + 12 NADPH per glucose.**
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