Multiple Choice
Which part of photosynthesis is primarily responsible for the production of sugars?
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9. Photosynthesis
Calvin Cycle
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The fixation of carbon dioxide in the first step of the Calvin cycle is facilitated by which enzyme?
A
ATP synthase
B
Ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO)
C
NADP+ reductase
D
Phosphoglycerate kinase
Verified step by step guidance1
Step 1: Understand the Calvin cycle, which is the light-independent reaction of photosynthesis. It occurs in the stroma of chloroplasts and involves the fixation of carbon dioxide to produce organic molecules.
Step 2: Recognize that the first step of the Calvin cycle is carbon fixation, where carbon dioxide is incorporated into an organic molecule.
Step 3: Identify the enzyme responsible for catalyzing the fixation of carbon dioxide. This enzyme is Ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO), which facilitates the reaction between carbon dioxide and ribulose-1,5-bisphosphate (RuBP).
Step 4: Note that ATP synthase, NADP+ reductase, and phosphoglycerate kinase are involved in other processes of photosynthesis but are not responsible for carbon fixation in the Calvin cycle.
Step 5: Conclude that RuBisCO is the correct enzyme for the fixation of carbon dioxide in the Calvin cycle, as it catalyzes the reaction forming 3-phosphoglycerate (3-PGA) from RuBP and CO2.
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