Rubisco catalyzes the fixation of CO2 with ribulose bisphosphate in the first step of the Calvin cycle.Group startsTrue or False

Answer: True

Rubisco, or ribulose-1,5-bisphosphate carboxylase/oxygenase, is indeed the enzyme responsible for catalyzing the first step of the Calvin cycle. During this process, Rubisco facilitates the reaction between carbon dioxide (CO2) and ribulose bisphosphate (RuBP), resulting in a six-carbon intermediate that quickly splits into two molecules of 3-phosphoglycerate (3-PGA). This reaction is crucial for the incorporation of atmospheric CO2 into organic molecules, which are essential for the production of sugars in plants. Therefore, the statement that Rubisco catalyzes the fixation of CO2 with ribulose bisphosphate in the first step of the Calvin cycle is true.