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Assertion (A): RuBisCO is called a bifunctional enzyme.
Reason (R): Its active site can bind both CO2 and O2.

  • (a) Both A and R are true, and R is the correct explanation of A. Correct
  • (b) Both A and R are true, but R is not the correct explanation of A. Your answer
  • (c) A is true but R is false. Your answer
  • (d) Both A and R are false. Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

Both are true and R explains A. RuBisCO is bifunctional because its active site can bind both CO2 (carboxylase) and O2 (oxygenase).

Why the other options are wrong

  • (b) · your answer R is the reason for A.
  • (c) · your answer R is true.
  • (d) · your answer Both are true.
NCERT point: The oxygenase activity causes photorespiration.
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