Multiple Choice
During the formation of a peptide bond between two amino acids, which molecule is released as a byproduct of the condensation reaction?
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4. Protein Structure
Peptide Bond
Multiple Choice
In biochemistry, what is a peptide bond?
A
A covalent amide linkage formed between the -carboxyl group of one amino acid and the -amino group of another, typically with loss of
B
A hydrogen bond between the carbonyl oxygen of one amino acid and the amino hydrogen of another
C
An ionic (salt) bridge formed between a protonated amino group and a deprotonated carboxylate group on amino acid side chains
D
A disulfide bond formed by oxidation of two cysteine side chains to create
Verified step by step guidance1
Understand that a peptide bond is a specific type of covalent bond important in biochemistry, particularly in the formation of proteins.
Identify the groups involved in forming a peptide bond: the \( \alpha \)-carboxyl group (\( -COOH \)) of one amino acid and the \( \alpha \)-amino group (\( -NH_2 \)) of another amino acid.
Recognize that the formation of a peptide bond involves a condensation (dehydration) reaction, where a molecule of water (\( H_2O \)) is lost.
Write the general reaction for peptide bond formation: \(\n\)\(\n\)\( \text{Amino acid 1} - COOH + H_2N - \text{Amino acid 2} \rightarrow \text{Amino acid 1} - CO - NH - \text{Amino acid 2} + H_2O \)
Note that the resulting bond between the carbonyl carbon and the nitrogen is called an amide linkage, which is the defining feature of a peptide bond.
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