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Question

During dark reaction for fixation of carbon, the three carbon atoms of each molecule of 3 phosphoglyceric acid (PGA) are derived from

A
RuBP only
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B
RuBP +CO2
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C
CO2 Only
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D
RuBP +CO2 +PEP
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Solution

The correct option is B RuBP +CO2

In carboxylation, ribulose 1,5 bisphosphate (RuBP) (= Ribulose diphosphate) acts as CO2 acceptor and 6 molecules of RuBP react with 6 molecules of CO2 and 6 molecules of water giving rise to 12 molecules of 3 phosphoglyceric acid.


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