Multiple Choice
Highlight the peptide bonds in the figure below & circle all the α-carbons. How many peptide bonds are there?
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4. Protein Structure
Peptide Bond
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which two atoms are directly connected by a peptide bond in a polypeptide chain?
A
The alpha carbon of one amino acid and the alpha carbon of the next amino acid
B
The carboxyl oxygen of one amino acid and the hydrogen of the amino group of the next
C
The side chain carbon of one amino acid and the side chain nitrogen of the next
D
The carbonyl carbon of one amino acid and the nitrogen of the next amino acid
Verified step by step guidance1
Understand the structure of a peptide bond: A peptide bond is a covalent bond formed between two amino acids during a condensation reaction, where a molecule of water is removed.
Identify the functional groups involved: Each amino acid has an amino group (-NH₂) and a carboxyl group (-COOH). The peptide bond forms between the carboxyl group of one amino acid and the amino group of the next amino acid.
Focus on the atoms directly involved: During the formation of the peptide bond, the carbonyl carbon (C=O) of the carboxyl group of one amino acid reacts with the nitrogen (N) of the amino group of the next amino acid.
Recognize the result of the reaction: The reaction produces a bond between the carbonyl carbon and the nitrogen, with the release of a water molecule (H₂O). This bond is what connects the two amino acids in the polypeptide chain.
Visualize the peptide bond: The peptide bond can be represented as: . This is the direct connection between the two amino acids in the chain.
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