🦠 Microbiology Solved MCQs with Answers

Practice 1927 approved 🦠 Microbiology questions with verified answers from the 🧬 Medical Science subject for Pakistan exams.

1927 solved MCQs

The plasmid which makes the host more pathogenic isAnswer: Virulence plasmid The expression of gene X (which has promoter Px) is to be monitored. A gene fusion construction for carrying this work willAnswer: have Px but not the rest of the X coding region The transducing particles carry only specific portions of the bacterial genome in which of the following transduction?Answer: Specialized transduction The correct term for the transfer of genetic material between bacteria in direct physical contact isAnswer: conjugation Plasmid that carries genes encoding enzymes, which degrade substances such as aromatic compounds, pesticides or sugar areAnswer: metabolic plasmid R factors involved in plant-microbe interactions areAnswer: plant proteins Which of the following is used by microbial genetisists as a tool?Answer: All of these Which of the following type of recombination does not require homologous sequences and is utilized by mobile genetic elements that move about chromosomes?Answer: Replicative recombination Which of the following term describes the relationship between a virus and host where no new viral particles are produced and the viral genome is replicated along with host chromosome?Answer: Lysogeny Inverted repeat sequences at each end and a gene encoding transposase is contained in which of the following transposable element?Answer: Insertion element F factor plasmids play a major role inAnswer: conjugation Which of the following genetic elements carry the genes required for integration into host chromosomes?Answer: Transposons The chromosomal genes, possessing fertility factor is known asAnswer: F prime factor Which of the following statement can describe horizontal transfer?Answer: The transmission of genetic information from one independent, mature organism to another Which of the following infection(s) can be diagnosed by the use of polymerase chain reaction?Answer: All of these Polymerase chain reaction basically consists ofAnswer: three steps The PCR/sequencing approach to rRNA is most likely to give information aboutAnswer: the species to which the bacteria are most closely related The efficiency of amplification in PCR in later cycles is reduced due toAnswer: all of these The original enzyme(s) used in PCR reaction is/are known asAnswer: E. coli DNA polymerase RNA populations can also be used as PCR templates after reverse transcription intoAnswer: c DNA The cloning step in PCR/sequencing analysis of microbial communities is necessary forAnswer: separating the different rRNA gene sequences in the mixture The template for PCR isAnswer: double stranded DNA Large parasites such as helminthes may be killed extracellularly by the action ofAnswer: eosinophils Which of the following is correct for CD8 T cells?Answer: CD8 T cells can kill individual virus-infected cells in a contact dependent fashion Passive immunization is done forAnswer: diphtheria Which of the following is correct for isoantigens?Answer: They are antigens found in some members of a species Numerous antibodies can be prepared, against one antigen, each binds to unique epitopes. How is this antibody diversity generated?Answer: Both (a) and (b) Which of the following expresses CD3 surface antigen?Answer: T cells Polymorphonuclear leukocytes (or PMNs)Answer: all of the above Major Histo Compatibility Complex (MHC) is a collection of genes arrayed onAnswer: chromosome 6 in man, chromosome 17 in mice