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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) […]

Q.69 The active transport of solute in the cell is characterized by (A) its uptake along the concentration gradient utilizing energy (B) requirement of a carrier to support transport along the […]

Q.68 Which one of the following statements is NOT associated with contributions of Louis Pasteur? (A) Anthrax is caused by anthrax bacillus (B) Bacteria causing food spoilage come from air (C) […]

Q.67 To select for spontaneously arising histidine auxotrophs in a population, you would use a medium containing (A) Histidine and penicillin (B) Penicillin but no histidine (C) Histidine and lysozyme (D) […]

Q.66 Quinolones inhibit bacterial growth by targeting (A) DNA replication (B) mRNA translation (C) RNA polymerase (D) active transport of nutrients into the cell Quinolones like ciprofloxacin block bacterial DNA processes […]

Q.65 Which of the following statements are INCORRECT on ecological point of view? P. Primary succession involving xerosere is initiated in a wet habitat Q. Halones commonly found in electronic equipment […]