The ratio of CO₂, NADPH₂, and ATP molecules required for one Calvin cycle is
Correct answer: B. 3, 6, 9
- A. 1, 2, 3
- B. 3, 6, 9
- C. 6, 12, 18
- D. 12, 24, 36
Explanation
The Calvin cycle, also known as the light-independent reactions of photosynthesis, uses 3 molecules of CO₂, 6 molecules of NADPH, and 9 molecules of ATP to produce one molecule of glyceraldehyde-3-phosphate (G3P), which can then be used to form glucose and other carbohydrates. Option B is correct, as it reflects these stoichiometric needs. Option A suggests a smaller scale of reaction that is not reflective of the cycle's full completion. Options C and D suggest larger scales than needed for a single cycle.
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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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