Final answer:
The peptide-bonded backbone is the structure of a peptide chain, composed of repeated -C-C-N- units. The bond has double bond character, limiting rotation. It affects the secondary and tertiary structure of proteins through hydrogen bonding.
Step-by-step explanation:
The peptide-bonded backbone refers to the structure of a peptide chain, which is composed of repeated -C-C-N- units. The peptide-bonded backbone is the structure of a peptide chain, composed of repeated -C-C-N- units. The bond has double bond character, limiting rotation. It affects the secondary and tertiary structure of proteins through hydrogen bonding.
The middle C represents the carbonyl C=O group and the C-N represents the peptide bond. Due to resonance, the peptide bond has about 40% double bond character, which limits rotation around the bond. The rigidity of the peptide bond affects the secondary and tertiary structure of proteins, as hydrogen bonds can form between N-H and C=O groups.