AP BIOLOGY

Detailed explanation-1: -The carbon dioxide acceptor in Calvin cycle is a five-carbon ketose sugar-Ribulose bisphosphate (RuBP). Its chemical name is Ribulose 1, 5-diphosphate.

Detailed explanation-2: -RuBisCO facilitates CO2 fixation (carboxylation) in the Calvin–Benson cycle, but at the same time, it also fixes O2 (oxygenation). The latter reaction is the first step of photorespiration.

Detailed explanation-3: -The primary acceptor of carbon dioxide molecule is phosphoenolpyruvic acid which is present in the chloroplast of mesophyll cells.

Detailed explanation-4: -Ribulose 1, 5-bisphosphate (RuBP) is an organic substance that is involved in photosynthesis, notably as the principal CO 2 acceptor in plants.

Detailed explanation-5: -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.