The first stable product of the Calvin cycle is
Correct answer: A. 3-phosphoglycerate
- A. 3-phosphoglycerate
- B. 1,3-biphosphoglycerate
- C. Glyceraldehyde-3-phosphate
- D. Ribulose-5-phosphate
Explanation
The correct option is 3-phosphoglycerate, as it is the first stable product formed during the Calvin cycle after carbon fixation. 1,3-biphosphoglycerate is an unstable intermediate formed later in the reduction phase. Glyceraldehyde-3-phosphate is produced after further reduction steps and is used for glucose synthesis. Ribulose-5-phosphate is an intermediate involved in the regeneration of ribulose-1,5-bisphosphate, not a direct product of carbon fixation.
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About Bioenergetics
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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