What happens during the carbon fixation stage of the Calvin cycle light independent reactions?

Question

A. Energy from ATP and electrons from NADPH are used to reduce 3-phosphoglycerate to form G3P Molecules (which can be used to form other organic molecules such as glucose)
B. They are pumped remaining G3P molecules that have not exited the cycle are used to reform RuBP through a series of chemical reactions so that the Calvin cycle can continue
C. Oxygen is produced through this process
D. The enzyme rubisco attaches CO2 to RuBP causing the formation of molecules of 3 phosphoglycrate

Answer 1

The correct answer is:

D. The enzyme rubisco attaches CO2 to RuBP causing the formation of molecules of 3-phosphoglycerate.

During the carbon fixation stage of the Calvin cycle, the enzyme ribulose bisphosphate carboxylase/oxygenase (commonly known as rubisco) facilitates the reaction that attaches carbon dioxide (CO2) to ribulose bisphosphate (RuBP). This reaction leads to the formation of an unstable intermediate that quickly splits into two molecules of 3-phosphoglycerate (3-PGA). This is the initial step of carbon fixation in the Calvin cycle.