Multiple Choice
Which atoms are not part of the peptide group?
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4. Protein Structure
Peptide Group
Multiple Choice
In the diagram below, the square plane drawn behind the protein molecule indicates the:
A
Plane of the peptide group due to absence of rotation & partial double-bond nature of the Cα-N bond.
B
Region of steric hindrance determined by the large C = O group.
C
Absence of rotation around the C-N bond because of its partial double-bond character.
D
Region of the peptide bond that contributes to a Ramachandran plot.
Verified step by step guidance1
Identify the components of the peptide bond in the diagram: The peptide bond is formed between the carbon atom (C) of the carboxyl group and the nitrogen atom (N) of the amino group.
Understand the nature of the peptide bond: The peptide bond has partial double-bond character due to resonance, which restricts rotation around the C-N bond.
Recognize the significance of the square plane: The square plane in the diagram represents the plane of the peptide group, indicating the lack of rotation around the C-N bond due to its partial double-bond nature.
Consider the implications of the partial double-bond character: This characteristic contributes to the rigidity and planarity of the peptide bond, which is crucial for the secondary structure of proteins.
Relate the peptide bond to the Ramachandran plot: The Ramachandran plot is used to visualize the dihedral angles of amino acid residues in protein structure, which are influenced by the rigidity of the peptide bond.
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