Biology

If RuBisCO were inhibited in a plant, the Calvin cycle would stop, preventing carbon fixation.

The primary function of RuBisCO in the Calvin cycle (light-independent reactions) is to catalyze the reaction between carbon dioxide (CO₂) and ribulose bisphosphate (C₅) to form two molecules of 3-phosphoglycerate (C₃). This is the initial step of carbon fixation, where inorganic carbon from CO₂ is incorporated into an organic molecule, like glucose.

If RuBisCO were inhibited in a plant, the enzyme cannot perform its function of fixing carbon dioxide. Without the ability to fix carbon dioxide, the subsequent steps of the Calvin cycle, which rely on the products of the initial carbon fixation step, cannot proceed. As a result, the Calvin cycle will stop.

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