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The enzyme that fixes CO₂ in the Calvin cycle is
Apyruvate kinase
BRuBisCO
CATP synthase
Drubisco activase
Answer & Solution
Correct answer: B. RuBisCO
RuBisCO joins CO₂ to RuBP, splitting into 2 molecules of 3-PGA. Most abundant protein on Earth, also leaky — fixes O₂ too, causing photorespiration.
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