Multiple Choice
Which statement best describes a peptide bond in proteins?
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4. Protein Structure
Peptide Bond
Multiple Choice
In biochemistry, what best describes a peptide bond?
A
An ionic (salt-bridge) interaction between positively charged and negatively charged amino acid side chains
B
An amide linkage formed between the carboxyl group of one amino acid and the amino group of another, created by a condensation (dehydration) reaction
C
A hydrogen bond between the backbone of one residue and the backbone of another residue
D
A disulfide bond formed by oxidation between the sulfhydryl groups of two cysteine residues
Verified step by step guidance1
Understand that a peptide bond is a specific type of covalent bond that links amino acids together in a protein chain.
Recognize that this bond forms between the carboxyl group (–COOH) of one amino acid and the amino group (–NH2) of another amino acid.
Know that the formation of a peptide bond involves a condensation (dehydration) reaction, where a molecule of water (H2O) is released.
Express the peptide bond as an amide linkage, which can be represented as –CO–NH– connecting the two amino acids.
Distinguish the peptide bond from other interactions such as ionic interactions (salt bridges), hydrogen bonds, and disulfide bonds, which are non-covalent or different covalent bonds important in protein structure but not peptide bond formation.
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