Q.29 The receptor for epinephrine is a(A) Tyrosine kinase receptor (B) Serine–threonine kinase receptor(C) G–protein–coupled receptor (D) Ligand activated transcription factor Answer: (C) G-protein-coupled receptor Epinephrine (adrenaline) binds to adrenergic receptors […]
Q.28 Which one of the following proteases does NOT cleave on the carboxyl side of any Arginineresidue in a protein?(A) Trypsin (B) Proteinase K(C) Thrombin (D) Chymotrypsin Answer: (B) Proteinase […]
Q.27 A mixture of Arginine, Phenylalanine and Histidine was fractionated using cation exchangechromatography at neutral pH. The amino acids were eluted with an increasing salt gradient. Identifythe correct order of […]
Q.26 During an enzyme catalyzed reaction, the equilibrium constant(A) increases(B) decreases(C) remains unchanged(D) can increase or decrease, depending on the enzyme Answer: (C) remains unchanged Enzymes act as catalysts that speed […]
Q.25 The order of acidity of the following acids is Given Compounds Compound Substituent (1) –OCH3 (Methoxy) (2) –CH3 (Methyl) (3) –NO2 (Nitro) (4) –H (Benzoic acid) Key Concept: Acidity […]
Q.24 A hydrocarbon that undergoes ozonolysis (reaction with ozone followed by reduction with Me2 S)to form formaldehyde and glyoxal is Key Concept: Ozonolysis Ozonolysis cleaves carbon–carbon double bonds. Each carbon […]
Q.23 The Fisher projection that represents (2R,3S)-2,3-dihydroxybutanoic acid is Given Compound Molecular structure of 2,3-dihydroxybutanoic acid: CH3–CHOH–CHOH–COOH The molecule contains two chiral centers at carbon 2 and carbon 3. Important […]
Q.22 At 298 K, the bond dissociation energies of C–H, C–C and C=C are 415, 344 and 615 kJ mol−1, respectively. The enthalpy of atomization of carbon is 717 kJ […]
Q.21 For a first order reaction, the time required for 50% completion is 20 minutes. The time required for 99.9% completion of the reaction is ________ minutes. For a first […]
Q.20 Assuming ideal behavior, the density of fluorine gas at 20 °C and 0.3 atm is ________ g L−1. (Molecular weight of F2 = 38 g mol−1, R = 0.082 L […]
