Question

How many molecules of ATP and NADPH are required for every molecule of CO₂ fixed in the Calvin cycle?

• A. 2 molecules of ATP and 3 molecules of NADPH
• B. 2 molecules of ATP and 2 molecules of NADPH
• C. 3 molecules of ATP and 3 molecules of NADPH
• D. 3 molecules of ATP and 2 molecules of NADPH

Answer 1

The Correct Option is D

In the Calvin cycle, for every molecule of CO fixed, 3 molecules of ATP and 2 molecules of NADPH are required to convert 3-phosphoglycerate (3-PGA) into G3P (Glyceraldehyde-3-phosphate).

- ATP provides the energy necessary for the phosphorylation steps, while NADPH provides the reducing power for the reduction steps.