First slide

Where are the ATP and NADPH Used?

Question

In the Calvin cycle, for the fixation of 1 molecule of CO₂, how many ATP and NADPH+H⁺ molecules are required in the reduction step?

Easy

A

18 ATP and 12 NADPH+H⁺
B

2 ATP and 2 NADPH+H⁺
C

10 ATP and 10 NADPH+H⁺
D

3 ATP and 2 NADPH+H⁺

Solution

In one turn of Calvin cycle, 2 molecules of 3-PGA are formed. Each molecule of 3-PGA is reduced to PGAL using 1 ATP and 1 NADPH+H⁺ molecule. Therefore, 2 ATP and 2 NADPH+H⁺ are required to reduce 2 molecules of 3-PGA formed during fixation of 1 molecule of CO₂.

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