For fixing 3 molecules of CO₂ in the Calvin cycle, what is needed?
Correct answer: A. 9ATP + 6NADPH
- A. 9ATP + 6NADPH
- B. 18ATP + 12NADPH
- C. 6ATP + 9NADPH
- D. 3ATP + 3NADPH
Explanation
The Calvin cycle, also known as the light-independent reactions of photosynthesis, requires 3 ATP and 2 NADPH molecules for the fixation of each CO₂ molecule. Therefore, for the fixation of 3 CO₂ molecules, the cycle uses a total of 9 ATP and 6 NADPH. Option A is correct, as it matches these requirements. Option B provides the requirements for fixing 6 CO₂ molecules, making it incorrect for this question. Option C suggests an excessive amount of NADPH, and Option D is only adequate for fixing one CO₂ molecule; thus, both are incorrect.
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Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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