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Multiple Choice
Which of the following reactions is catalyzed by the enzyme RuBisCO in the Calvin cycle?
A
Oxidation of glyceraldehyde-3-phosphate to 3-phosphoglycerate
B
Reduction of 3-phosphoglycerate to glyceraldehyde-3-phosphate
C
Carboxylation of ribulose-1,5-bisphosphate
D
Regeneration of ribulose-1,5-bisphosphate
Verified step by step guidance
1
Understand the role of RuBisCO: RuBisCO (Ribulose-1,5-bisphosphate carboxylase/oxygenase) is a crucial enzyme in the Calvin cycle, primarily responsible for catalyzing the carboxylation reaction.
Identify the substrates and products: RuBisCO catalyzes the reaction where carbon dioxide is added to ribulose-1,5-bisphosphate, resulting in the formation of two molecules of 3-phosphoglycerate.
Differentiate between the reactions: The oxidation and reduction reactions mentioned involve glyceraldehyde-3-phosphate and 3-phosphoglycerate, which are not directly catalyzed by RuBisCO.
Focus on the carboxylation process: The carboxylation of ribulose-1,5-bisphosphate is the specific reaction catalyzed by RuBisCO, where CO2 is fixed into an organic molecule.
Conclude with the correct reaction: Based on the understanding of RuBisCO's function, the correct reaction catalyzed by this enzyme in the Calvin cycle is the carboxylation of ribulose-1,5-bisphosphate.