Biology

The primary role of the enzyme RuBisCO in the Calvin cycle is to fix carbon dioxide into an organic molecule.

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. This is the main role of RuBisCO in the Calvin cycle.

The other options are incorrect:

Option A: Pigments such as chlorophyll and carotenoids are responsible for absorbi...