MCAT Organic Chemistry Question 138: Answer and Explanation
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Question: 138
3. Which of the following amino acids contain(s) sulfur?
I. Cysteine
II. Serine
III. Methionine
- A. I only
- B. I and III only
- C. II and III only
- D. I, II, and III
Correct Answer: B
Explanation:
Cysteine is well known for containing a sulfur atom because it is able to form disulfide bridges; however, methionine also contains a sulfur atom in its R group.