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The only enzyme that can act both as a carboxylase and as an oxygenase, and is the most abundant enzyme on earth, is

  • (a) RuBisCO Correct
  • (b) NADP reductase Your answer
  • (c) ATP synthase Your answer
  • (d) PEP carboxylase Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

RuBisCO (ribulose bisphosphate carboxylase-oxygenase) can bind both CO2 (carboxylase) and O2 (oxygenase), and it is the most abundant enzyme on earth.

Why the other options are wrong

  • (b) · your answer NADP reductase reduces NADP+; it has no carboxylase or oxygenase activity.
  • (c) · your answer ATP synthase makes ATP; it is not a carboxylase.
  • (d) · your answer PEP carboxylase fixes CO2 but has no oxygenase activity.
NCERT point: The oxygenase activity of RuBisCO is the cause of photorespiration.
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