AP BIOLOGY

Detailed explanation-1: -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-2: -Indeed, the most important biological mechanism for fixing carbon dioxide is very inefficient, which is very much down to one enzyme: ribulose‐1, 5‐bisphosphate carboxylase/oxygenase, or RuBisCo for short.

Detailed explanation-3: -Ribulose-1, 5-bisphosphate carboxylase/oxygenase (Rubisco) is Earth’s most abundant enzyme, used by autotrophic organisms to convert CO2 into organic compounds via the Calvin-Benson pathway (Andersson and Backlund, 2008).

Detailed explanation-4: -RuBisCO refers to ribulose bisphosphate carboxylase oxygenase. They are known to have an affinity for both oxygen and carbon dioxide. It catalyzes both carboxylation during photosynthesis and oxygenation reaction during photorespiration. It is involved in anabolic reactions.

Detailed explanation-5: -Although CO2 is required for activation of rubisco, results indicated that within the range of CO2 concentrations used (110-990 microliters per liter), rubisco activity in soybean leaflets, in the light, was not regulated by CO2.