Multiple Choice
In proteins, how is a peptide bond formed between two amino acids?
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4. Protein Structure
Peptide Bond
Multiple Choice
Which of the following best represents the backbone atom arrangement of two peptide bonds?
A
Cα----N----Cα----C----Cα----N----Cα----C.
B
Cα----N----C----C----N----Cα.
C
C----N----Cα----Cα----C----N.
D
Cα----C----N----Cα----C----N.
E
Cα----Cα----C----N----Cα----Cα----C.
Verified step by step guidance1
Understand the structure of a peptide bond: A peptide bond is formed between the carboxyl group of one amino acid and the amino group of another, resulting in a C-N bond.
Identify the repeating unit in a polypeptide chain: The backbone of a polypeptide chain consists of repeating units of -N-Cα-C- where N is the nitrogen atom of the amine group, Cα is the alpha carbon, and C is the carbonyl carbon.
Analyze the given options: Look for the sequence that correctly represents the repeating unit of the peptide backbone, which should include the sequence -Cα-C-N-.
Check for continuity: Ensure that the sequence can be repeated to form a continuous chain, which is characteristic of polypeptides.
Select the correct option: The correct sequence should be Cα----C----N----Cα----C----N, as it accurately represents the backbone arrangement of two peptide bonds in a polypeptide chain.
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