Question

The number of carbon atoms present in ribulose biphosphate is

• A. 6
• B. 5
• C. 4
• D. 3

Answer 1

The correct option is B 5

Ribulose biphosphate is required in the first step of the biochemical process of carbon fixation. Ribulose biphosphate reacts with carbon dioxide to produce 3-keto-2-carboxyarabinitol 1,5-bisphosphate. It needs an enzyme RuBisCO and ATP to do this. The number of carbon atoms present in ribulose biphosphate is five. Its chemical name is Ribulose-1,5-diphosphate and chemical formula is $C_5{H}_{12}{O}_{11}{P}_{12}$. It is found in the stroma of a chloroplast where the Calvin cycle takes place.