How many molecules of carbon dioxide enter the Calvin cycle to produce one molecule of carbohydrate?
Correct answer: B. 3
- A. 2
- B. 3
- C. 4
- D. 1
Explanation
During the Calvin cycle, three molecules of carbon dioxide (CO₂) combine with three molecules of ribulose-1,5-bisphosphate (RuBP) through the enzyme RuBisCO. This produces six molecules of 3-phosphoglycerate (3-PGA), which are then reduced using ATP and NADPH to form one molecule of glyceraldehyde-3-phosphate (G3P) - a 3-carbon carbohydrate. Therefore, three CO₂ molecules are required to produce one molecule of a 3-carbon carbohydrate (G3P).
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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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