MCAT Organic Chemistry Question 136: Answer and Explanation
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Question: 136
1. Which of the following amino acids does not have an L-enantiomer?
- A. Cysteine
- B. Threonine
- C. Glutamic acid
- D. Glycine
Correct Answer: D
Explanation:
Glycine’s R group is a hydrogen atom; this amino acid is therefore achiral because the central carbon is not bound to four different substituents. The other amino acids are all chiral and therefore have both L- and D-enantiomers.