MCAT Biochemistry Question 146: Answer and Explanation
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Question: 146
11. Which enzyme converts GDP to GTP?
- A. Nucleosidediphosphate phosphatase
- B. Nucleosidediphosphate kinase
- C. Isocitrate dehydrogenase
- D. Pyruvate dehydrogenase
Correct Answer: B
Explanation:
The conversion of GDP to GTP is a phosphorylation reaction, in which a phosphate group is added to a molecule. Such reactions are catalyzed by kinases. Nomenclature is helpful here, as nucleosidediphosphate kinase is the only enzyme that contains kinase in its name.