Question

How many carbon atoms would a molecule have which after accepting (fixing) $C{O}_2$, would have 3 carbons (of PGA)?

Answer 1

Part 1: The Calvin cycle
In the C3 pathway or Calvin cycle, the carboxylation of a five-carbon compound called RuBP results in the formation of two molecules of a stable product called 3-Phosphoglycerate (3-PGA).