Question

The primary acceptor of carbon in Calvin cycle contains how many carbon atoms?

• A. 5 carbon atoms
• B. 3 carbon atoms
• C. 1 carbon atom
• D. 4 carbon atoms

Answer 1

The correct option is A 5 carbon atoms

RuBP, the first acceptor of carbon dioxide, is a 5 carbon ketose sugar with the chemical formula $C_5{H}_{12}{O}_{11}{P}_2$. On accepting a $C{O}_2$ molecule, RuBP undergoes carboxylation to form two molecules of 3-phosphoglycerate (a 3 carbon compound).