AP BIOLOGY

Detailed explanation-1: -RuBisCO catalyzes a reaction between CO2 and RuBP. For each CO2 molecule that reacts with one RuBP, two molecules of 3-phosphoglyceric acid (3-PGA) form. 3-PGA has three carbons and one phosphate.

Detailed explanation-2: -The Calvin cycle has three stages. In stage 1, the enzyme RuBisCO incorporates carbon dioxide into an organic molecule. In stage 2, the organic molecule is reduced. In stage 3, RuBP, the molecule that starts the cycle, is regenerated so that the cycle can continue.

Detailed explanation-3: -Carbon fixation is the first step of the Calvin cycle. It involves the enzyme RuBisCO ‘’fixing” CO2 to RuBP, producing two molecules of 3-PGA. Three molecules of CO2 are needed for the Calvin cycle to go through one full turn, producing six 3-PGA molecules. The second step is the reduction of 3-PGA to make G3P.

Detailed explanation-4: -3-PGA is the first stable product of the Calvin cycle.

Detailed explanation-5: -In that first step of carbon fixation, the enzyme rubisco captures carbon dioxide from the atmosphere in order for it to be able to be fixed. The Calvin cycle and carbon fixation are very important because all organisms depend on them in order for the environment to run smoothly.