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Q.73. Which one of the following conditions favors maximum expression of lac operon genes in E. coli? (A) Glucose-low, lactose-low, cAMP-high (B) Glucose-high, lactose-low, cAMP-high (C) Glucose-low, lactose-high, cAMP-high (D) […]

Q.72. Which one of the following will increase the resolution of a light microscope? (A) Decreasing the numerical aperture of the objective lens (B) Using an objective lens with a […]

Q.71. Which one of the following does NOT provide three-dimensional images? (A) Atomic force microscopy (B) Confocal scanning laser microscopy (C) Differential interference contrast microscopy (D) Phase-contrast microscopy The correct […]

Q.70. Which one of the following diseases is treated by a neuraminidase inhibitor? (A) Chickenpox (B) Polio (C) Influenza (D) Japanese encephalitis Neuraminidase inhibitors treat influenza by blocking the viral […]

Q.69. Shifting a Saccharomyces cerevisiae culture from fermentative to aerobic respiratory mode will (A) decrease carbon dioxide production (B) increase alcohol production (C) increase glucose consumption (D) decrease ATP generation […]

Q.68. Choose the correct taxonomical hierarchy among the following: (A) Species, Genus, Family, Order, Class, Phylum, Domain (B) Species, Genus, Order, Class, Family, Phylum, Domain (C) Species, Genus, Order, Family, […]

Q.67. The antibacterial trimethoprim is an inhibitor of (A) dihydrofolate reductase (B) dihydropteroate synthetase (C) 𝑁5, 𝑁𝐼0-methenyl tetrahydrofolate synthetase (D) serine hydroxymethyl transferase Trimethoprim targets bacterial folate synthesis as a […]

Q.66. The technique of microbial “pure culture” was pioneered by (A) Edward Jenner (B) Louis Pasteur (C) Robert Hooke (D) Robert Koch The technique of microbial “pure culture,” essential for […]

Q.65. A double homozygous mutant develops green and wrinkled seeds. When it was crossed with a true-breeding plant having yellow and round seeds, all the F1 plants developed yellow and […]

Q.64. Selection markers and the corresponding genes used in plant genetic engineering are given below Selection Marker P. Kanamycin Q. Hygromycin R. Bialaphos S. Mannose Gene i. ℎ𝑝𝑡𝐼𝑉 ii. bar […]