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Q.83 In a phenol coefficient test for determining the efficacy of a disinfectant X, the maximum effective dilution for X and phenol was found to be 1/450 and 1/90, respectively. […]

Q.82 Match the microscopes in Group I with their working principles in Group II Group I Group II P. Phase contrast Q. Dark field R. Bright field S. Electron microscopy I. […]

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 […]