The peptide bond of all proteins forms with highly specific orientation. This orientation contains atoms linked in which of the following ways?
A) C-N-C-C
B) C-N-H-C
C) C-O-N-C
D) C-C-O-N
E) C-S-S-C

Question

Quizplus · Accepted Answer

The peptide bond in proteins is formed between the carboxyl group of one amino acid and the amino group of another, resulting in a C-N-C-C linkage.  The peptide bond is formed between the α-carbon of one amino acid and the α-amino nitrogen of the adjacent amino acid, therefore the orientation of the atoms would be C-N. The second C in the correct orientation is α-carbon of the C-terminal amino acid and the last C atom of the correct answer represents the carbon of the carboxylic acid residue of the C-terminal amino acid in the peptide bond.

The Peptide Bond of All Proteins Forms with Highly Specific