General Science • BiologyHard
Which enzyme catalyzes the rate-limiting step of the Calvin cycle, fixing carbon dioxide into 3-phosphoglycerate in the stroma of chloroplasts?
A. Phosphofructokinase
B. Ribulose-1,5-bisphosphate carboxylase-oxygenase✓ Correct Answer
C. ATP synthase
D. Pyruvate dehydrogenase
💡 Solution & Explanation
Ribulose-1,5-bisphosphate carboxylase-oxygenase facilitates carbon fixation by attaching carbon dioxide to ribulose bisphosphate, initiating the light-independent reactions of photosynthesis. Phosphofructokinase catalyzes a committed regulatory step in glycolysis inside the cytoplasm. ATP synthase generates adenosine triphosphate using proton motive force across energy-transducing membranes. Pyruvate dehydrogenase links glycolysis to the citric acid cycle within the mitochondrial matrix.
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