The Calvin cycle, a critical component of photosynthesis, utilizes the energy and reducing power from the light-dependent reactions to synthesize organic molecules. Which of the following is the direct and immediate product of the Calvin cycle that serves as a precursor for glucose and other carbohydrates?
Show answer and explanation
The answer
Correct answer: A. Glyceraldehyde-3-phosphate (G3P) is the three-carbon sugar directly produced, which can be converted into glucose.
Tested concept: Calvin cycle
Explanation
The Calvin cycle's primary direct output is glyceraldehyde-3-phosphate (G3P), a three-carbon sugar. Two molecules of G3P can then be combined to form a six-carbon glucose molecule, or used to synthesize other organic compounds. Glucose is not directly produced by the Calvin cycle itself. Oxygen gas is a byproduct of the light-dependent reactions, not the Calvin cycle. While ATP and NADPH are consumed and their precursors (ADP and NADP+) are regenerated during the Calvin cycle, they are inputs from the light reactions, not direct products of the Calvin cycle itself.
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