Q39 / 180 · NEET 2025 · Botany

Which of the following statements about RuBisCO is true?

  • A
    It is active only in the dark
  • B
    It has higher affinity for oxygen than carbon dioxide
  • C
    It is an enzyme involved in the photolysis of water
  • Correct answer
    D
    It catalyzes the carboxylation of RuBP

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.

Hence, the correct answer is option: 'D'.

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