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Which one of the following statements is correct?

1. All amino acids except lysine are optically active
2. All amino acids are optically active
3. All amino acids except glycine are optically active
4. All amino acids except glutamic acids are optically active

Correct answer: All amino acids except glycine are optically active

Solution

All standard amino acids have a chiral alpha-carbon except glycine (its alpha-carbon bears two H atoms), so all amino acids except glycine are optically active.

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