Multiple Choice
Of the following, which occurs during the Calvin cycle?
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9. Photosynthesis
Calvin Cycle
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The enzyme rubisco combines RuBP with a carbon atom from:
A
Glucose
B
ATP
C
Carbon monoxide
D
Organic compounds
E
Carbon dioxide
F
NADPH
Verified step by step guidance1
Understand the role of the enzyme rubisco in the Calvin cycle, which is part of photosynthesis. Rubisco is responsible for fixing carbon dioxide from the atmosphere.
Recognize that RuBP (ribulose bisphosphate) is a 5-carbon sugar that acts as a substrate for rubisco in the Calvin cycle.
Identify that the process of carbon fixation involves the incorporation of carbon dioxide into an organic molecule, which is facilitated by rubisco.
Note that rubisco catalyzes the reaction between RuBP and carbon dioxide, resulting in a 6-carbon intermediate that quickly splits into two molecules of 3-phosphoglycerate (3-PGA).
Conclude that the carbon atom that rubisco combines with RuBP comes from carbon dioxide, which is the correct answer to the problem.
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