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Distinguish between : Carboxylation and Oxygenation.

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S. No. Carboxylation Oxygenation
(i) It is the first step of Calvin cycle (C3 in biosynthetic phase). The oxygenation of RuBP in presence of O2: is the first reaction of photorespiration.
(ii) Ribulose 1, 5 bisphosphate is acceptor molecule in it. The initial acceptor molecule is RuBP.
(iii) Ribulose 1, 5 biphosphate combines with a molecule of CO2 in presence of light regulated enzyme RuBP carboxylase The photorespiration is initiated in the chloroplasts in light only.
(iv) Fixation of CO2 is called carboxylation. The activity of RuBP to catalyse the combination of O2 with RuBP is oxygenation.

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