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Q.76 Frederick Griffith used smooth (S) and rough (R) strains of Streptococcus pneumoniae in hisclassical experiment that showed DNA might be the genetic element. Which ONE of the followingobservations gave the […]

Q.75 Select the technique most appropriate to demonstrate that lactose induces the synthesis of β-galactosidase enzyme. Options: (A) Northern Blot (B) Western Blot (C) Quantitative PCR (D) Southern Blot Western […]

Q.74 Match the disease in Group I with their corresponding organism in Group II Group I Group II P. African sleeping sickness Q. Rocky mountain spotted fever R. Mumps S. […]

Q.73 Antibody coated pathogens are recognized by effector cells through(A) CD4 receptor (B) FC receptor (C) CD8 receptor (D) IFN gamma receptor Antibody-coated pathogens are recognized by effector cells through Fc […]

Q.72 Which ONE of the following statements about E.coli is NOT true ?(A) E.coli was the first disease- causing bacterium identified by Robert Koch(B) E.coli is part of the normal […]

Q.71 A rich medium is inoculated with a bacterium that divides every 30 minutes. The number of bacteria at the end of 50 hours is Options: (A) 2 × 1010 […]

Q.70 An E.coli mutant constitutive for the lac operon was mated with a wild type strain. The merodiploidthus obtained was inducible by lactose. This observation indicates that the original mutation is(A) […]

Q.69 Which ONE of the following mutants is used to carry out genetic analysis to determine the functionof an essential gene?(A) Knock out mutant (B) Deletion mutant(C) Insertion mutant (D) Temperature […]

Q.68 An auxotrophic mutant arises spontaneously in a wild type E.coli culture growing in a rich medium.Which ONE of the following techniques will ensure the isolation of the auxotrophic mutant?(A) Replica […]

Q.67 Bergey’s Manual of Systematic Bacteriology groups bacteria into species according to their(A) nutritional requirement(B) phylogenetic relationships(C) pathogenic properties(D) morphology Bergey’s Manual of Systematic Bacteriology groups bacteria into species according to […]