If the intracellular pH of a cell becomes basic, which one of the following will help reduce the pH? (1) Export of Cl and import of HCO (2) Import of Cl and export of HCO (3) Import of Na” and HCO3- and export of Cl (4) Export of Na’ and Cl If the intracellular pH … Read more
If the pH of a solution goes from 8 to 7, this means that the hydrogen ion concentration has: (1) decreased by 1 mole/liter. (2) increased by 1 mole/liter. (3) decreased 10 fold. (4) increased 10 fold The pH scale is logarithmic, meaning that a decrease of 1 unit in pH corresponds to a 10-fold … Read more
If 5 ml of 20% ethanol is mixed with 25 ml of 80% ethanol, the resulting solution will approximately be (1) 50% ethanol (3) 100% ethanol (2) 70% ethanol (4) 80% ethanol
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
Match enzymes of TCA cycle in Group I with that of their products listed in Group II. Group I P. Isocitrate dehydrogenase Q. Succinate dehydrogenase R. Fumarase S. x-Ketoglutarate dehydrogenase Group II 1. x-Ketoglutarate 2. Succinyl CoA 3. Fumarate 4. Malate (1) P-1, Q-2, R-4, S-3 (2) P-3, Q-1, R-2, S-4 (3) P-2, Q-4, R-3, … 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
Arrange the three residues, glycine, phenylalanine and proline, in the decreasing order of backbone flexibility (1) Gly > Phe > Pro (2) Pro > Gly > Phe (3) Phe > Pro > Gly (4) It is not possible to comment Backbone flexibility in amino acids depends on the torsional freedom of the main chain (Φ, … Read more
In a polypeptide chain, a cis-to-trans rearrangement of two consecutive proline residues can be achieved by rotating the: (1) O angle to 10° (2) w angle to 180° (3) Ψ angle to 0° (4) x angle to 60° In a polypeptide chain, cis-to-trans isomerization primarily involves rotation around the peptide bond (ω angle). ω (omega) … Read more