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45. If the backbone -NH2 group in amino acids are modified to -NH(CH3) group, how will the allowed regions in Ramachandran map of the modified protein change? A. Allowed region […]

44. The keto (left) and enol (right) tautomerized structures of guanine is shown below. The keto and enol forms of cytosine and thymine are shown below. Which of the following […]

43. An enzyme has a Vmax of 50 mol product formed (minute X mg protein)-1 and a Km of 10 M for the substrate. When a reaction mixture contains the […]

42. Arrange the metabolites in increasing order of phosphoryl transfer potential p) ATP, q) Phosphoenolpyruvate, r) 1,3-Bisphosphoglycerate, s) pyrophosphate a) s

41. The spine of a neuron is approximately a sphere of diameter 1μm. The concentration of K+ within this spine is 150mM. How many K+ ions are in this sphere? […]

40. Which number of signals are observed for the following compound in 13C-NMR proton decoupled spectrum? A. One B. Two C. Eight D. Four The correct answer is A. One signal in […]

39. The following pair of compounds is an example of A. Positional Isomers B. Functional Isomers C. Stereo Isomers D. None The given pair of compounds represents keto–enol tautomers, which […]

38. Secondary alcohols on catalytic dehydrogenation by Cu-Ni couple give; a) Ketone b) Aldehyde c) Carboxylic acid d) Amine Secondary alcohols undergo catalytic dehydrogenation by Cu-Ni couple to yield ketones.​ […]

37. Which of the following equations represents an oxidation-reduction reaction? A. Ba(NO3)2 + Na2SO4 → BaSO4 + 2NaNO3 B. H3PO4 + 3KOH → K3PO4 + 3H2O C. Fe(s) + S(s) […]

36. The pKa of the amino group of a zwitterion is 9.6. In a 0.1 M solution of the zwitterion at pH=9.0, what percentage of the amino group of the […]