Is Gly-Ala-His the same tripeptide as His-Ala-Gly?
A) No, they are constitutional isomers.
B) No, they are stereoisomers.
C) Yes, they are conformers.
D) Yes, they are the same molecule, just flipped over.
E) Yes, the written order of amino acids does not make a difference in the peptide.

Question

Quizplus · Accepted Answer

The sequence of amino acids in a peptide determines its identity. Gly-Ala-His and His-Ala-Gly have the same amino acids but in a different order, making them different molecules, not isomers or conformers of the same molecule.

Is Gly-Ala-His the Same Tripeptide as His-Ala-Gly