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Question

In photosynthesis CO2 combines with

A
RUDP or RUBP
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B
ATP
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C
ADP
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D
PGA
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Solution

The correct option is A RUDP or RUBP
During the dark phase of photosynthesis, carbon dioxide combines with RUBP or RUDP (ribulose bi/di phosphate) in the carboxylation reaction catalyzed by enzyme RUBISCO (ribulose-1,5-bisphosphate carboxylase/oxygenase). The carboxylation of RUBP generates 3 PGA or 3 phosphoglyceric acid, which is the first stable product of dark phase.

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