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Question
How many molecule(s) of 3-PGA (3-phosphoglycerate) is/are produced per CO2 molecule fixed in the Calvin cycle?
How many molecule(s) of 3-PGA (3-phosphoglycerate) is/are produced per CO2 molecule fixed in the Calvin cycle?
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Solution
The correct option is B 2
Calvin cycle occurs in the stroma of chloroplast during which there is synthesis of glucose. It includes three stages - carboxylation, reduction and regeneration.
During carboxylation, CO2 combines with RuBP (primary acceptor molecule of CO2) and forms an unstable 6 carbon compound. This reaction is catalysed by the enzyme RuBisCO. The unstable 6 carbon compound splits into two molecules of 3-PGA. Hence, for every one CO2 molecule fixed, two molecules of 3-PGA are produced.
Calvin cycle occurs in the stroma of chloroplast during which there is synthesis of glucose. It includes three stages - carboxylation, reduction and regeneration.
During carboxylation, CO2 combines with RuBP (primary acceptor molecule of CO2) and forms an unstable 6 carbon compound. This reaction is catalysed by the enzyme RuBisCO. The unstable 6 carbon compound splits into two molecules of 3-PGA. Hence, for every one CO2 molecule fixed, two molecules of 3-PGA are produced.
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