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The enzyme that carboxylates RuBP is

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

Your answer: Correct answer: (b)

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Explanation

Why (b) is correct

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

Why the other options are wrong

(a) · your answer PEP carboxylase carboxylates PEP, not RuBP.
(c) · your answer NADP reductase reduces NADP⁺ in the light reaction.
(d) · your answer ATP synthase makes ATP.

NCERT point: RuBisCO is the most abundant enzyme in the world.

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