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26. Match the entries in Column-1 with those in Column-2 Column-1                                     Column-2 P. […]

25. Which one of the following is NOT a receptor tyrosine kinase? (A) Platelet derived growth factor receptor (B) Insulin like growth factor -1 receptor (C) Macrophage colony stimulating factor […]

24. A closed circular B-DNA of 4000 base pairs is negatively supercoiled by introduction of 4 writhes. The super helical density of the resultant DNA molecule will be ____ Understanding […]

23. Which one of the following does NOT constitute the lipid moiety in lipid-linked membrane proteins? (A) Palmitic acid (B) Stearic acid (C) Farnesyl groups (D) Myristic acid Palmitic acid, […]

22. Which one of the following amino acid substitutions is likely to cause the largest change in protein conformation? (A) Phe → Ile (B) Ser → Thr (C) Gln → […]

21. The formation of a carbocation, also called an oxonium ion, occurs during the reaction catalyzed by (A) aldolase (B) lysozyme (C) ribonuclease A (D) ) carboxypeptidase The correct answer […]

20. Proteolytic enzymes are usually biosynthesized as large, inactive precursors known as (A) holoenzymes (B) ribozyme (C) zymogens (D) apoenzymes Proteolytic enzymes are biosynthesized as large, inactive precursors called zymogens […]

19. Ribulose-5-phosphate epimerase is involved in which one of the following processes? (A) Glycolysis (B) TCA cycle (C) Glycosylation (D) Pentose phosphate pathway Ribulose-5-phosphate epimerase, also known as ribulose-phosphate 3-epimerase […]

18. Oxidation of one molecule of glucose via the glycerol-phosphate shuttle produces (A) 32 molecules of ATP (B) 32 molecules of NADPH (C) 30 molecules of ATP (D) 30 molecules […]

17. Which one of the following bases is NOT found in the T-arm of an aminoacyl t-RNA? (A) Dihydrouridine (B) Pseudouridine (C) Uracil (D) Guanine The correct answer is (D) Guanine. […]