Question:
Glycylalanine is a dipeptide of which amino acids?
Glycylalanine is a dipeptide of which amino acids?
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In peptide nomenclature, the first amino acid name changes to the “yl” form, while the second amino acid name remains unchanged.
Updated On: Jun 22, 2026
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The Correct Option is A
Solution and Explanation
Step 1: Understand the naming of dipeptides.
A dipeptide name is formed from the names of two amino acids.
The first amino acid loses the suffix “-ine” and takes the form “-yl” The second amino acid retains its original name.
Step 2: Identify the amino acids in glycylalanine.
The name glycylalanine contains: \[ \text{glycyl} \rightarrow \text{glycine} \] and alanine Thus, glycylalanine is formed from glycine and alanine.
Step 3: Write the structures of glycine and alanine.
Structure of glycine: \[ H_2NCH_2COOH \] Structure of alanine: \[ H_2NCH(CH_3)COOH \] These structures are present in option (1).
Step 4: Final conclusion.
Therefore, glycylalanine is a dipeptide formed from \[ \boxed{\text{glycine and alanine}} \]
A dipeptide name is formed from the names of two amino acids.
The first amino acid loses the suffix “-ine” and takes the form “-yl” The second amino acid retains its original name.
Step 2: Identify the amino acids in glycylalanine.
The name glycylalanine contains: \[ \text{glycyl} \rightarrow \text{glycine} \] and alanine Thus, glycylalanine is formed from glycine and alanine.
Step 3: Write the structures of glycine and alanine.
Structure of glycine: \[ H_2NCH_2COOH \] Structure of alanine: \[ H_2NCH(CH_3)COOH \] These structures are present in option (1).
Step 4: Final conclusion.
Therefore, glycylalanine is a dipeptide formed from \[ \boxed{\text{glycine and alanine}} \]
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