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MCAT Biology Question — Amino Acids: Peptide Bond
- by
- Jun 16, 2014
- MCAT Biology, MCAT Blog, MCAT Question of the Day
- Reviewed By: Liz Flagge
Which structure shows two amino acids linked by 1 peptide bond?
Explanation
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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