In this question I have doubt in the answer as in oxygenation a molecule of phosphoglycerate and a molecule of phosphoglycerate(2carbon) is formed but here it is written that a 3 carbon molecule is formed?

Please clarify it soon.

Dear student,

During the typical Calvin cycle, the 6 molecules of RuBP (5-C) reacts with 6 molecules of carbon dioxide (1-C) in presence of RUBISCO enzyme to form 12 molecules of 3-PGA (3-phosphoglycerate).

However, In photorespiration, the RUBISCO enzyme may sometimes fix oxygen with RuBP in hot conditions to form phosphoglycolate (2-C).

Regards

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