AP BIOLOGY

Detailed explanation-1: -Rubisco takes carbon dioxide and attaches it to ribulose bisphosphate, a short sugar chain with five carbon atoms.

Detailed explanation-2: -Ribulose-1, 5-bisphosphate carboxylase/oxygenase (Rubisco; EC 4.1. 1.39) catalyzes the addition of gaseous carbon dioxide to ribulose-1, 5-bisphosphate (RuBP), generating two molecules of 3-phosphoglyceric acid (3-PGA), and is thus the key enzyme in CO2 assimilation.

Detailed explanation-3: -RuBisCO catalyzes a reaction between CO2 and RuBP. For each CO2 molecule that reacts with one RuBP, two molecules of another compound, 3-phosphoglycerate (3-PGA), form. 3-PGA has three carbon atoms and one phosphate. Each turn of the cycle involves only one RuBP and one carbon dioxide and forms two molecules of 3-PGA.

Detailed explanation-4: -Rubisco can bind to either carbon dioxide or oxygen depending on environmental conditions. Binding to carbon dioxide and initiation of the Clavin cycle is favored at low temperatures and at a high carbon dioxide-to-oxygen ratio.