Answer :
The role of rubisco in the Calvin cycle is rubisco incorporates CO2 from the atmosphere into an organic molecule. Option B is correct.
Rubisco, or ribulose-1,5-bisphosphate carboxylase/oxygenase, is an enzyme that plays a critical role in the Calvin cycle, which is the process by which plants and some other organisms convert carbon dioxide into organic molecules.
Rubisco catalyzes the first step in the cycle by incorporating carbon dioxide from the atmosphere into a five-carbon molecule called ribulose-1,5-bisphosphate (RuBP). This reaction forms two molecules of a three-carbon compound called 3-phosphoglycerate, which are then used to synthesize sugars and other organic molecules.
Rubisco is considered one of the most important enzyme on Earth because it drives the process of carbon fixation, which is the conversion of carbon dioxide into organic compounds that form the basis of life. However, rubisco is also known for its relatively low catalytic efficiency and tendency to catalyze a competing reaction that leads to the loss of carbon from the cycle.
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