Question

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

Options

• 3 molecules of ATP and 3 molecules of NADPH

• 3 molecules of ATP and 2 molecules of NADPH

• 2 molecules of ATP and 3 molecules of NADPH

• 2 molecules of ATP and 2 molecules of NADPH

Answer 1

3 molecules of ATP and 2 molecules of NADPH

Explanation:

In the Calvin cycle, 3 ATP molecules and 2 NADPH molecules are used for each fixed CO₂ molecule. While NADPH supplies reducing power for the transformation of CO₂ into carbs, ATP supplies energy.