MCAT Biochemistry Question 26: Answer and Explanation
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Question: 26
11. The conversion of ATP to cyclic AMP and inorganic phosphate is most likely catalyzed by which class of enzyme?
- A. Ligase
- B. Hydrolase
- C. Lyase
- D. Transferase
Correct Answer: C
Explanation:
Lyases are responsible for the breakdown of a single molecule into two molecules without the addition of water or the transfer of electrons. Lyases often form cyclic compounds or double bonds in the products to accommodate this. Water was not a reactant, and no cofactor was mentioned; thus lyase, choice (C), remains the best answer choice.