Multiple Choice
Which of the following reactions involves the addition of a nucleophile to a carbonyl group?
3. Acids and Bases
Organic Chemistry Reactions
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What is the product of the carbon fixation reaction catalyzed by Rubisco in the Calvin cycle?
A
Glucose
B
Glyceraldehyde-3-phosphate
C
Ribulose bisphosphate
D
3-phosphoglycerate
Verified step by step guidance1
Understand the role of Rubisco: Rubisco is an enzyme that catalyzes the first major step of carbon fixation in the Calvin cycle, which is crucial for photosynthesis in plants.
Identify the substrate: The substrate for Rubisco is ribulose-1,5-bisphosphate, a 5-carbon sugar that reacts with carbon dioxide.
Recognize the reaction: Rubisco catalyzes the reaction between ribulose-1,5-bisphosphate and carbon dioxide, resulting in an unstable 6-carbon intermediate.
Break down the intermediate: The unstable 6-carbon intermediate quickly splits into two molecules of 3-phosphoglycerate, a 3-carbon compound.
Conclude the product formation: The immediate product of the reaction catalyzed by Rubisco is 3-phosphoglycerate, which is then used in subsequent steps of the Calvin cycle.
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