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Q.81 Match the infectious agents in Group I with the associated diseases in Group II Group I Group II P. Bordetella pertussis Q. Mycobacterium leprae R. Haemophilus influenzae S. Rubella I. […]

Q.80 Match the scientists in Group I with their contributions in microbiology in Group II Group I Group II P. Robert Hooke Q. Paul Ehrlich R. Antony van Leeuwenhoek S. […]

Q.79 When the supply of tryptophan is plentiful, the tryptophan operon is repressed because the(A) repressor protein-corepressor complex is bound at the operator(B) repressor protein is synthesized in large quantity(C) repressor-corepressor […]

Q.78 In a population containing fast and slow growing bacteria, the slow growing bacteria can beenriched by supplementing the medium with(A) chloramphenicol (B) penicillin (C) penicillin & chloramphenicol (D) rifampin Penicillin […]

Q.77 Which one of the following is TRUE about siderophores in bacteria?(A) Siderophores are secreted only when soluble iron is available in the medium(B) Siderophores form complex with ferrous ions in […]

Q.76 In an experiment the structural genes lacZYAof lac operon were found to be constitutivelyexpressed. The following explanations were given for the constitutive expression(P) absence of a functional repressor due to […]

Q.75 Chemostat is a continuous culture system in which sterile medium is fed into the culture vessel at the same rate as the spent medium is removed. If in a […]

Q.74 The enzyme that catalyzes the reduction of nitrogen to ammonia is (A) Nitrogenase (B) Nitrate reductase (C) Nitrite reductase (D) Deaminase Nitrogenase is the enzyme that catalyzes the reduction […]

Q.73 If the radius of a spherical coccus is 0.8 μm, the value of surface area volume in μm−1 will be (A) 7.45 (B) 4.05 (C) 3.75 (D) 0.85 Introduction […]

Q.72 Which one of the following DO NOT use water as an electron source during photosynthesis?(A) Sulfate reducing bacteria(B) Methanogenic bacteria(C) Green and purple bacteria(D) Nitrifying bacteria Methanogenic bacteria do […]