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In an alpha helical polypeptide, the backbone hydrogen bonds are between (1) NH of n and CO of n + 4 amino acids (2) CO of n and NH of […]

The position of collagen triple helix in Ramachandran plot is at- (1) Top Left (2) Top right (3) Bottom right (4) Bottom left Collagen Triple Helix Position in the Ramachandran […]

Acetyl-(Ala)18-CONH2 exists in α-helical conformation in solution. Most of the backbone dihedral angles (φ, Ψ) will be. (1) -600, -300 (2) 600,300 (3) -600 ,-300 (50%) and 600, 300 (50%) […]

Which one of the statements on protein conformation, detailed below is INCORRECT? (1) L- amino acids can occur in Type l’ ß- turns where ϕ, Ψ are positive (2) A […]

ϕ and Ψ values for right handed a helix of L-amino acid are expected to be (1) ϕ Negative, Ψ negative (2) ϕ Negative, Ψ positive (3) ϕ Positive, Ψ […]

Which one of the following statements on protein conformation is NOT true? (1) Dihedral angles of side-chains in amino acids are depicted in the Ramachandran plot. (2) Infrared spectroscopy can […]

9. The regions of phi, psi space occupied by well characterized protein secondary structures are marked on a Ramachandran plot as shown above. Which of the following statements is CORRECT? […]

The Ramachandran plot graphically shows which combination of torsional angles phi (φ) and psi (Ψ) of amino acid residues contained in a peptide are possible. Examination of the plot below […]

Choose the correct statement about peptides in Ramchandran plot. (1) Peptides that are unstructured will have all the backbone dihedral angles in the disallowed regions. (2) It is not possible […]

If the pyrollidine ring of proline is reduced to a linear to a linear form, the new amino acid will have (1) constrained ϕ than proline (2) constrained Ψ than […]