If you were to take 1.0 ml of a solution of HCl with a pH of 4.0 and add it to 9.0 ml of distilled water, what would be the pH of the final solution? (1) The pH would remain unchanged. (2) The pH would rise to 5.5. (3) The pH would rise to 5.0. … Read more
What will be the required volumes of 1N HCl and 4N NaOH to prepare one litre solution of pH 77 (1) 500 ml, 500 ml. (3) 600 ml, 400 ml (2) 800 ml, 200 ml (4) 200 ml, 800 ml To prepare 1 litre of a solution with pH = 7 using 1N HCl and … Read more
Which of the following statements are TRUE for hydrogen bonds? Strength of hydrogen bond is (1) high in a solvent of high dielectric constant (2) low in a solvent of low dielectric constant (3)lower in water as compared to organic solvents (4) higher in water as compared to organic Hydrogen bond strength is influenced by … Read more
Among the following bonds where rotation is not allowed in a peptide chains? (1) ψ (2) ω (3) x (4) φ In a peptide chain, rotation is restricted due to partial double-bond character of certain bonds. Let’s analyze each option: 1. ψ (Psi) angle – Rotation Allowed ✅ This is the Cα–C bond (between the … Read more
The measured values of main chain torsion angles of a residue in a polypeptide has values (Φ=+50, Ψ=+60). What type of secondary structure is it most likely to be present in?
(1) Left-handed a-helix
(2) Right-handed a-helix
(3) Type II ẞ-turn
(4) Parallel B-sheet
In peptides the values of dihedral angle phi (D) is based on rotation around (1) N-Ca bond (2) Ca -C’ bond (3) C’-N bond (4) N-H bond The phi (φ) angle in peptides is defined as the dihedral angle around the N–Cα bond. This angle is measured between the plane formed by the C’ (of … Read more