MCAT Organic Chemistry Question 138: Answer and Explanation

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Test Information

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.

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