Tag: csir previous year question

The following are four statements on the peptides/proteins conformation: A. Glycine has a largest area of conformationally allowed space in the Ramachandran plot of Φ and Ψ B. A 20-residue […]

Given below are statements related to protein structures: A. The dihedral angles of an amino acid X in Acetyl-x- N-Methyl amide in the Ramachandran plot, occur in very small but […]

The hemagglutinin protein in influenza virus contains a long α-helix, with 53 residues. Which of the following correctly describes the attributes of this α helix? (1) The length is 75.6 […]

How many hydrogen bonds involving the backbone CO and NH can be observed in an a-helix consisting of 15 amino acid residues? (1) 10 (2) 11 (3) 12 (4) 13 […]

An α-helix in a peptide or protein is characterized by hydrogen bonds and characteristic dihedral angles. Choose the right combination. (1) Hydrogen bonding between the amide CO of residue i […]

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 […]