Which of the following molecules is reduced by accepting hydrogen in the Calvin cycle?
Correct answer: A. 1,3-Bisphosphoglycerate
- A. 1,3-Bisphosphoglycerate
- B. Ribulose-1,5-bisphosphate
- C. 3-phosphoglycerate
- D. Glyceraldehyde-3-phosphate
Explanation
The molecule that is reduced by accepting hydrogen in the Calvin cycle is 1,3-bisphosphoglycerate. This reduction step, driven by NADPH, converts 1,3-bisphosphoglycerate into glyceraldehyde-3-phosphate, representing the key phase where energy and reducing power from light reactions are used to form carbohydrate precursors.
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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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