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Q.79 Which of the statements about Corynebacterium diphtheriae biology is NOT CORRECT? (A) All strains of C. diphtheriae are producers of diphtheria toxin (B) Diphtheria toxin production can be minimized by […]

Q.78 An actively growing culture of E. coli divides in about 20 min. Under laboratory conditions, time taken to replicate the entire genome of this bacterium would be about: (A) 20 […]

Q.77 Which one of the following forms of the same DNA molecule would bind maximum ethidium bromide? (A) Negatively supercoiled (B) Covalently closed relaxed circle (C) Linear (D) Positively supercoiled Negatively […]

Q.76 Four Hfr strains of E. coli were generated from the same F+ strain. The Hfr strains donated markers in the following order: Strain 1: DQWMT; Strain 2: AXPTM; Strain 3: […]

Q.75 Which one of the following immersion oils would you use to get the best resolution in a light microscope (with 100× objective)? (A) an oil with refractive index of 1.6 […]

Q.74 Which of the following are expected to be the abundant inhabitants of a nitrate- and sulfate-rich soil naturally depleted for oxygen? (A) Pseudomonas and Azotobacter (B) Pseudomonas and Desulfovibrio (C) […]

Q.73 The cis–trans test can determine whether a gene codes for (A) an activator or a repressor (B) an RNA or a protein (C) a protein with the same or different […]

Q.72 The synthesis of an immunoglobulin in either a secretory or membrane bound form is governed by (A) allelic exclusion (B) class switching (C) differential RNA processing (D) affinity maturation […]

Q.71 A newly emerged variant of Influenza virus can be selectively propagated from the mixed population by addition of (A) Ganciclovir (B) Tamiflu (C) Interferon gamma (D) Neutralizing antibody Neutralizing antibodies […]

Q.70 Catabolite repression allows cells to save energy by (A) inactivating catabolic enzymes (B) inhibiting synthesis of total RNA (C) regulating expression of genes required for utilization of less-efficient metabolites (D) […]