Apentix/AP Biology/Unit 1: Chemistry of Life/Question
AP Biologymediummcq1 pt

During translation, which statement best describes the peptide bond that extends a growing polypeptide?

A.A covalent C–N bond linking the backbone of adjacent amino acid residues
B.A hydrogen bond between backbone atoms that stabilizes local folding of the growing chain
C.An ionic attraction between charged R groups that holds neighboring residues together
D.A covalent bond formed directly between two amino acid side chains during elongation

Explanation

Core Concept

A peptide bond is the covalent C–N linkage that joins amino acid residues in a polypeptide backbone. During ribosomal translation, the growing peptide is transferred to the amino group of the incoming aminoacyl-tRNA; describing this step as simple dehydration between two free amino acids is inaccurate.

Correct Answer

AA covalent C–N bond linking the backbone of adjacent amino acid residues

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