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The active site of RuBisCO can bind

  • (a) both CO2 and O2 Correct
  • (b) neither CO2 nor O2 Your answer
  • (c) O2 only Your answer
  • (d) CO2 only Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

The active site of RuBisCO can bind both CO2 and O2. That is why it is called a carboxylase-oxygenase.

Why the other options are wrong

  • (b) · your answer It binds both.
  • (c) · your answer It also binds CO2; in fact it prefers CO2.
  • (d) · your answer It can also bind O2, which leads to photorespiration.
NCERT point: The relative concentration of O2 and CO2 decides which one binds.
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