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The enzyme RuBisCO catalyses the joining of CO₂ to which molecule?
Aglucose, the final product
BG3P (glyceraldehyde-3-phosphate)
CRuBP, a 5-carbon sugar
DATP, the energy currency
Answer & Solution
Correct answer: C. RuBP, a 5-carbon sugar
RuBisCO catalyses the carboxylation of RuBP: CO₂ + RuBP → unstable 6-carbon → 2 × 3-PGA. The first stable step of carbon fixation in C3 plants. G3P is the downstream reduction product; glucose is the eventual exit product; ATP is energy currency.
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