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PCAT Biological Processes – Amino Acids: Peptide Bond

Which structure shows two amino acids linked by 1 peptide bond?

amino acids


Amino acids are joined by a peptide bond: 1) the leading amino acid has a primary amine group to the left, 2) the peptide bond has a carbonyl group immediately following the first amino acid side chain, 3) bonded to a secondary amine leading the second amino acid side chain, and 4) the second amino acid finishes with a carboxylic acid group. Choice (D) is correct.

A) incorrect, Leads and ends with a carboxylic acid group.

B) incorrect, Leading amine has five bonds.

C) incorrect, Leads and ends with an amine group.

D) correct.

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