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What is the total number of chiral carbon atoms present across the four amino acids: Glycine, Alanine, Arginine, and Lysine?

1. 1
2. 2
3. 3
4. 4

Correct answer: 3

Solution

Glycine has two identical H substituents on its alpha-carbon, so it has zero chiral centers. Alanine, Arginine, and Lysine each have one chiral alpha-carbon, giving a total of 3.

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