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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