Which of the following statements about RuBisCO is true?

Options

AIt is active only in the dark
BIt has higher affinity for oxygen than carbon dioxide
CIt is an enzyme involved in the photolysis of water
DIt catalyzes the carboxylation of RuBP

Correct answer

D. It catalyzes the carboxylation of RuBP

Step-by-step solution

Carboxylation is the most crucial step of the Calvin cycle where

\mathrm{CO}_2

is utilised for the carboxylation of RuBP. This reaction is catalysed by enzyme RuBP carboxylase. Since this enzyme also has an oxygenase activity, RuBisCO has higher affinity for carbon dioxide than oxygen.

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