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Answer: 4. It catalyzes the carboxylation of RuBP.

Key idea: RuBisCO is the carboxylating enzyme of the Calvin cycle.

It catalyses carboxylation of RuBP with CO2. It works in light as well, has a higher affinity for CO2 than O2 in normal conditions (though it also acts as oxygenase), and is not involved in photolysis of water. Option 4.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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