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Q.83. A bacterial culture has a generation time of 34 minutes. The time taken (in minutes, rounded off to two decimal places) for the 𝐎𝐃𝟓𝟓𝟎 of this exponentially growing culture […]

Q.82. A bacterial culture containing 𝟑 × 𝟏𝟎𝟓 live cells was exposed to a newly developed sterilizing agent. After 30 minutes of exposure, 3 live cells remained in culture. The […]

Q.81. Which one of the following is an example of substrate level phosphorylation? (A) Glucose to Glucose 6-phosphate (B) Fructose 6-phosphate to Fructose 1,6-bisphosphate (C) 1,3-bisphosphoglycerate to 3-phosphoglycerate (D) 2-phosphoglycerate […]

Q.80. An example of a differential and selective medium in which colonies of Gram-negative bacteria produce large amounts of acidic products and appear green with a metallic sheen is (A) […]

Q.79. Which one of the following statements about control of microbial growth is NOT correct? (A) Nonionizing radiation leads to thymine dimers formation in DNA (B) Spirochetes and mycoplasma can […]

Q.78. Determine the correctness or otherwise of the following Assertion [a] and the Reason [r]. Assertion [a]: Diphtheria exotoxin is an example of A-B type toxin. Reason [r]: The A […]

Q.77. Match the process involved in nitrogen or sulfur cycle in Group I with the corresponding microbe in Group II. Group I P. Denitrification Q. Nitrogen fixation by free-living microbe […]

Q.76. Digestion of an immunoglobulin G (IgG) molecule with pepsin will NOT (A) generate a bivalent antigen binding fragment (B) generate monovalent antigen binding fragments (C) destroy the complement binding […]

Q.75. A 𝟐𝟓𝟎𝝁𝐥 of bacteriophage stock containing 𝟖 × 𝟏𝟎𝟖 phages /𝐦𝐥 is added to 𝟓𝟎𝟎𝝁𝐥 of E. coli culture containing 𝟒 × 𝟏𝟎𝟖 cells /𝐦𝐥. The multiplicity of infection […]

Q.74. Match the cellular organelle in Group I with its function in Group II Group I P. Golgi apparatus Q. Nucleolus R. Peroxisome S. Proteasome (A) P− 3, Q − […]