Multiple Choice
A Ramachandran plot shows:
4. Protein Structure
Ramachandran Plot
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Which of the following statements is true for the portion of the peptide shown in the figure below?
A
Arrow A is pointing to the phi bond, B is pointing to the psi bond.
B
Arrow B is pointing to the phi bond, C is pointing to the psi bond.
C
Arrow C is pointing to the phi bond, A is pointing to the psi bond.
D
Arrow C is pointing to the phi bond, B is pointing to the psi bond.
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. The backbone of a peptide consists of repeating units of -N-Cα-C-.
Identify the phi (φ) and psi (ψ) bonds: The phi bond is the angle around the N-Cα bond, and the psi bond is the angle around the Cα-C bond.
Examine the diagram: Locate the N-Cα bond and the Cα-C bond in the peptide structure. The phi bond (φ) is associated with the N-Cα bond, and the psi bond (ψ) is associated with the Cα-C bond.
Analyze the arrows: Arrow A is pointing to the N-Cα bond, Arrow B is pointing to the Cα-C bond, and Arrow C is pointing to the C-N bond.
Determine the correct statement: Based on the analysis, Arrow A is pointing to the phi bond, and Arrow B is pointing to the psi bond. Therefore, the statement 'Arrow A is pointing to the phi bond, B is pointing to the psi bond' is true.
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