How many of the given compounds will give a positive Biuret test?
Glycine, Glycylalanine, Tripeptide, Biuret

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Canvas Classes · Accepted Answer

The Biuret test yields a positive result selectively for molecules containing two or more peptide (or amide) linkages directly spaced nearby. Let's analyze the given set:
1. Glycine: An isolated amino acid, exactly  peptide bonds (Negative).
2. Glycylalanine: A dipeptide, explicitly  peptide bond (Negative).
3. Tripeptide: Contains exactly  continuous peptide bonds (Positive).
4. Biuret: The namesake standard molecule containing exactly two structurally equivalent amide-like linkages (Positive).

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