Multiple Choice
In the context of peptide bonds, what is a polypeptide?
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4. Protein Structure
Peptide Bond
Multiple Choice
In proteins, what best describes a peptide bond?
A
An ester linkage formed between a carboxyl group and a hydroxyl group on amino acid side chains
B
A hydrogen bond formed between backbone carbonyl oxygen and amide hydrogen in secondary structure
C
An amide linkage formed by condensation between the carboxyl group of one amino acid and the amino group of another amino acid
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.
Recall that amino acids have a carboxyl group (-COOH) and an amino group (-NH2) as part of their backbone structure.
Recognize that a peptide bond forms through a condensation (dehydration) reaction where the carboxyl group of one amino acid reacts with the amino group of another, releasing a molecule of water (H2O).
Identify that this bond is an amide linkage, characterized by the bond between the carbonyl carbon (C=O) of one amino acid and the nitrogen (N-H) of the adjacent amino acid.
Distinguish peptide bonds from other types of bonds mentioned: ester linkages (between carboxyl and hydroxyl groups), hydrogen bonds (non-covalent interactions stabilizing secondary structure), and disulfide bonds (covalent bonds between cysteine side chains).
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