MCAT Biochemistry Question 12: Answer and Explanation
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Question: 12
12. Which of these amino acids has a side chain that can become ionized in cells?
- A. Histidine
- B. Leucine
- C. Proline
- D. Threonine
Correct Answer: A
Explanation:
Histidine has an ionizable side chain: its imidazole ring has a nitrogen atom that can be protonated. None of the remaining answers have ionizable atoms in their side chains.