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Which of the following statements about RuBisCO is true?

  • (a) It has a higher affinity for oxygen than for carbon dioxide. Your answer
  • (b) It catalyses the carboxylation of RuBP. Correct
  • (c) It is an enzyme involved in the photolysis of water. Your answer
  • (d) It is active only in the dark. Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

RuBisCO (RuBP carboxylase-oxygenase) catalyses the carboxylation of RuBP: it joins CO2 to RuBP to form two molecules of 3-PGA.

Why the other options are wrong

  • (a) · your answer RuBisCO has a much higher affinity for CO2 than for O2; O2 competes only when CO2 is low.
  • (c) · your answer Water is split by the water-splitting complex of PS II, not by RuBisCO.
  • (d) · your answer RuBisCO works during the day, when ATP and NADPH are being made.
NCERT point: RuBisCO is the most abundant enzyme in the world.
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