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RuBisCO is so named because it

  • (a) reduces CO2 and oxidises water together Your answer
  • (b) can act as a carboxylase and as an oxygenase Correct
  • (c) breaks down ribulose into two smaller sugars Your answer
  • (d) converts PGA back into ribulose bisphosphate Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

RuBisCO stands for RuBP carboxylase-oxygenase: it can act as a carboxylase (binding CO2) and as an oxygenase (binding O2).

Why the other options are wrong

  • (a) · your answer RuBisCO does not oxidise water.
  • (c) · your answer RuBisCO does not split ribulose into smaller sugars; it adds CO2 or O2 to RuBP.
  • (d) · your answer Converting PGA back to RuBP is the regeneration stage, done by other enzymes.
NCERT point: The oxygenase activity leads to photorespiration.
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