Biology

The molecule fixed into organic molecules during the Calvin cycle is carbon dioxide (CO₂).

The main function of the Calvin cycle is carbon fixation. The first step of the Calvin cycle involves the enzyme catalyzing the reaction between carbon dioxide (CO₂) and ribulose bisphosphate (C₅) to form two molecules of 3-phosphoglycerate (C₃). Through a series of reactions, carbon dioxide is ultimately fixed into organic molecules such as glucose.

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