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Q. No 31. Binding of an antibody to its cognate antigen does NOT involve (A) Covalent bonds (B) Van der Waals forces (C) Electrostatic forces (D) Hydrogen bonds Covalent bonds […]

Q.No.30. Har Gobind Khorana and Marshall Nirenberg elucidated the genetic code by using a cell-free protein synthesizing system. It was töund that and poly(C) result in synthesis of poly(L-Phe) and […]

Q.29. The human major histocompatibility complex (MHC) is (A)Polygenic and monomorphic (B)Polygenic and polymorphic (C)Monogenic and polymorphic (D)Monogenic and monomorphic Answer: (A) Polygenic and monomorphic The human major histocompatibility complex […]

Q.No.28. The reaction involved in the direct conversion of L-phenylalanine to L-tyrosine is (A) Hydroxylation (B) Decarboxylation (C) Transamination (D) Reduction The direct conversion of L-phenylalanine to L-tyrosine occurs through […]

Q. No27. Which one of the following bonds is NOT present in ATP? (A) Phosphoanhydride (B) N-Glycosidic (C) ?-Glycosidic (D) α-Glycosidic The bond NOT present in ATP is α-glycosidic. ATP […]

Q. No26. Which one of the following hormones initiates a signal cascade by directly binding to an intra-cellular receptor? (A) Insulin (B) Gonadotropin (C) Progesterone (D) Epinephrine Progesterone initiates a […]

Q. No.25. At a given pressure, a substance is heated from 2000 K to 2600 K. If the entropy of the substance is 60 J K-1 mol-1, and is assumed […]

Q24. The activation energy (Ea) estimated for a reaction from the Arrhenius equation is 21 kJ mol-1. The frequency factor is assumed to be independent of temperature. The ratio of […]

Q23. The standard potential E0cell for a cell reaction given below is +0.7 V. The standard reaction free energy ΔrG° for this cell is _______Kj mol-1 (correct up to two […]

Q.No.22. A molecule in solution crystallizes into two different crystal forms with rate constants of 0.02 s-1 and 0.13 s-1. If the crystallization is assumed to be under kinetic control, […]