AP BIOLOGY

Detailed explanation-1: -This reaction is catalyzed by the enzyme RuBP carboxylase/oxygenase, or rubisco. Reduction. In the second stage, ATP and NADPH are used to convert the 3-PGA molecules into molecules of a three-carbon sugar, glyceraldehyde-3-phosphate (G3P).

Detailed explanation-2: -Calvin cycle is operated by 11 different enzymes that catalyze 13 reactions. The “key” regulatory enzymes are RuBisCO, FBPase, SBPase, and PRK. These enzymes play a major role as they control the rate of CO2 fixation.

Detailed explanation-3: -Introduction. Ribulose 1, 5-bisphosphate carboxylase-oxygenase (RuBisCO) is the enzyme responsible for the fixation of carbon derived from atmospheric CO2 as part of the Calvin-Benson cycle that leads to production of the glucose essential for growth in most photosynthetic organisms.

Detailed explanation-4: -RuBisCO catalyzes a reaction between CO2 and RuBP, which forms a six-carbon compound that is immediately converted into two three-carbon compounds. This process is called carbon fixation, because CO2 is “fixed” from its inorganic form into organic molecules.

Detailed explanation-5: -Ribulose-1, 5-bisphosphate carboxylase/oxygenase, better known by the name Rubisco, is the key enzyme responsible for photosynthetic and chemoautotrophic carbon fixation and oxygen metabolism.