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Why is the substrate for the reaction in the Calvin Cycle catalyzed by rubisco traditionally considered...

Why is the substrate for the reaction in the Calvin Cycle catalyzed by rubisco traditionally considered a catalytic molecule?

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It is discovered by Calvin and Benson and their colleagues in California USA.It is called Calvin or C3 cycle.Process involved is autoradiography..

RUBISCO causes photosynthetic carboxylation .In this ribulose 1,5-biphosphate as a receptor of carbon dioxide and Ribulose 1,5 biphosphate carboxylase-oxygenase or RuBisCo as enzyme.

Carbon dioxide combines with ribulose -1,5biphosphate to produce transient intermediate compound called 2-catboxy 3-keto 1,5-biphosphoribotol.Thd intermediate splits up immediately in presence of water to form the two molecules of 3-phosphoglyceric acid or PGA.It is the first stable product of photosynthesis.

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