What is the ratio of ATP to NADPH required for one turn of the Calvin cycle?
Answer
3 ATP : 2 NADPH
The correct answer is 3 ATP : 2 NADPH — Thus the ratio of ATP to NADPH per cycle is 3:2.
Step-by-step solution
- Recall the stoichiometry of the Calvin cycle: for each CO₂ fixed, 3 ATP and 2 NADPH are consumed.
- Thus the ratio of ATP to NADPH per cycle is 3:2.
Common mistake: Forgetting the ATP requirement or miscounting NADPH
Concept tested: Calvin cycle energy ratio
Published · How this solution was prepared and checked
← All Photosynthesis in Higher Plants questions