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Multiple Choice
In the Calvin cycle, how many molecules of NADPH are required to synthesize one molecule of glyceraldehyde-3-phosphate (G3P)?
A
4
B
3
C
2
D
6
Verified step by step guidance
1
Understand the Calvin cycle: The Calvin cycle is a series of biochemical reactions that take place in the stroma of chloroplasts in photosynthetic organisms. It is also known as the light-independent reactions or dark reactions.
Identify the role of NADPH: In the Calvin cycle, NADPH is used as a reducing agent to convert 3-phosphoglycerate (3-PGA) into glyceraldehyde-3-phosphate (G3P).
Determine the number of NADPH molecules required: Each molecule of 3-PGA requires one molecule of NADPH for its reduction to G3P.
Calculate the total NADPH needed for one G3P: Since three molecules of 3-PGA are needed to form one molecule of G3P, three molecules of NADPH are required.
Conclude the requirement: Therefore, to synthesize one molecule of G3P, three molecules of NADPH are needed in the Calvin cycle.