🦠 Microbiology Solved MCQs with Answers

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

1927 solved MCQs

Three stop codons, which aids in termination of translation are also known asAnswer: nonsense codons The ribosome binding siteAnswer: is located immediately upstream of the start codon Which of the following molecule catalyzes the transpeptidation reaction?Answer: Peptidyl transferase Which of the termination codon is called amber?Answer: UAG The plasmid-mediated properties is/areAnswer: all of these In the extracellular medium, DNA-degrading enzymes would likely be to prevent transfer of DNA byAnswer: natural transformation What is the term used for a segment of DNA with one or more genes in the centre and the two ends carrying inverted repeat sequences of nucleotides?Answer: Transposon What is the term used for a segment of DNA with one or more genes in the centre and the two ends carrying inverted repeat sequences of nucleotides?Answer: Transposon The plasmids can be eliminated from a cell by the process known asAnswer: curing Recombination of virus genomes occursAnswer: simultaneous infection of a host cell by two viruses with homologous chromosomes The type of recombination that commonly occurs between a pair of homologous DNA sequences is,Answer: general recombination Which of the following statement describes plasmids?Answer: Small, circular DNA molecules that can exist independently of chromosomes commonly found in bacteria In lysogeny,Answer: a bacteriophage genome is integrated into the bacterial genome A microarray differs from a gene fusion in that, itAnswer: all of the above Who discovered transposons (jumping genes)?Answer: McClintock Which type of plasmid can exist with or without being integrated into the host's chromosome?Answer: Episome The main difference between a self-transmissible and a mobilizable plasmid is that the self-transmissible plasmidAnswer: carries genes encoding the mating apparatus Which of the following is the cause for drug resistance in tuberculosis?Answer: Mutation The transposase gene encodes an enzyme that facilitateAnswer: site-specific integration of transposable elements The term used for plasmids possessing both RTF and r determinants isAnswer: conjugative plasmids Diagnostic DNA probes have been developed forAnswer: all of the above Which of the following statement(s) is/are true in regards to F+ x F- mating events?Answer: DNA is transferred from F+ to F- cells Which of the following type of recombination does not require homologous sequences and is important for the integration of viral genomes into bacterial chromosomes?Answer: Site-specific recombination What information can be generated by interrupted mating experiments?Answer: Bacterial genome maps Which of the following transport bacterial DNA to other bacteria via bacteriophages?Answer: Transduction When composite transposons are formedAnswer: two IS elements integrate into a chromosome with only a small distance separating them Which of the following plamids do not possess information for self transfer to another cell?Answer: Non-conjugative plasmids The term used for acquisition of naked DNA from its environment and its incorporation in their genome by a bacterium isAnswer: transformation What is term used for a bacterial cell that is able to take up naked DNA?Answer: Competent Penicillin resistance in staphylococci is acquired due toAnswer: transduction