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Which of the following amino acids contains a secondary (2 degrees) amino group in its structure?

1. Glycine
2. Glutamine
3. Phenylalanine
4. Proline

Correct answer: Proline

Solution

Proline contains a secondary amine because its alpha-amino group is incorporated into a five-membered pyrrolidine ring, bonding the nitrogen to two carbon atoms rather than one, unlike all other standard alpha-amino acids.

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