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33. The role of enzyme E synthesized by phage X174 during host infection is to (A) block peptidoglycan synthesis (B) enhance synthesis of viral +RNA (C) inhibit lipid metabolism (D) […]

32. Which of the following statements is correct? (A) Gram negative bacteria are colored purple after Gram staining (B) Gram negative bacteria are commonly more resistant to antibiotics than Gram […]

31. Plasmid mediated antibiotic resistances in bacteria are acquired by (A) hydrolysis by b-lactamase (penicillin resistance). (B) expression of aminoglycoside modifying enzyme (kanamycin resistance). (C) mutation in DNA gyrase (quinolone […]

30. Match the entries in Group I with that in Group II. Group I                                  […]

29. Viral capsids are made up of morphological subunits called capsomeres. One of the common capsomeres is icosahedral. The icosahedron is a regular polyhedron with (A) 16 triangular facets and […]

28. Which one of the following statements is CORRECT for Mycoplasma? (A) Their cells are of definite shape. (B) They are resistant to lysis by osmotic shock. (C) Their growth […]

27. Which one of the following protozoan parasites belongs to the phylum Apicomplexa? (A) Toxoplasma gondii (B) Leishmania donovani (C) Entamoeba histolytica (D) Trichomonas vaginalis Protozoan Parasites of Phylum Apicomplexa: […]

26. In a bacterium, a mutation resulted in an increase of KS (substrate-specific constant) for ammonium from 50 µM to 5000 µM without affecting µmax. The specific growth rate (µ) […]

25. Match the entries in Group I with entries in Group II Group I                        Group II (P) Bacteria    […]

24. Which one of the following statements is INCORRECT with respect to bacterial conjugation? (A) It facilitates transfer of genetic material (B) It requires flagellum (C) It can spread antibiotic […]