Microbial Recombination and Gene Transfer problems
- 1. Which of the following genetic elements carry the genes required for integration into host chromosomes?
Options- A. Replicon
- B. Plasmids
- C. Transposons
- D. Tandons Discuss
Correct Answer: Transposons
- 2. Who discovered transposons (jumping genes)?
Options- A. Abelson
- B. Harvey
- C. McClintock
- D. Griffith Discuss
Correct Answer: McClintock
- 3. Diagnostic DNA probes have been developed for
Options- A. Mycobacterium tuberculosis
- B. Hepatitis B virus
- C. Human immunodeficiency virus
- D. all of the above Discuss
Correct Answer: all of the above
- 4. When composite transposons are formed
Options- A. a small deletion occurs in the transposase gene of an IS element
- B. a small deletion occurs in the transposase gene of an IS element and plasmid is integrated
- C. an IS element integrates with another IS element with the help of a plasmid
- D. two IS elements integrate into a chromosome with only a small distance separating them Discuss
Correct Answer: two IS elements integrate into a chromosome with only a small distance separating them
- 5. 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?
Options- A. Plasmid
- B. Transposon
- C. Insertion sequence
- D. None of these Discuss
Correct Answer: Transposon
- 6. The type of recombination that commonly occurs between a pair of homologous DNA sequences is,
Options- A. mutagenic recombination
- B. site-specific recombination
- C. replicative recombination
- D. general recombination Discuss
Correct Answer: general recombination
- 7. The plasmid which makes the host more pathogenic is
Options- A. F factors
- B. Metabolic plasmid
- C. Virulence plasmid
- D. None of these Discuss
Correct Answer: Virulence plasmid
- 8. The transposase gene encodes an enzyme that facilitate
Options- A. viral replication within a genome
- B. general recombination
- C. site-specific integration of transposable elements
- D. none of the above Discuss
Correct Answer: site-specific integration of transposable elements
- 9. Which of the following statement describes plasmids?
Options- A. Another name for a protoplast
- B. A complex membrane structure that covers the chromosome of bacteria
- C. Small, circular DNA molecules that can exist independently of chromosomes commonly found in bacteria
- D. None of the above Discuss
Correct Answer: Small, circular DNA molecules that can exist independently of chromosomes commonly found in bacteria
- 10. In the extracellular medium, DNA-degrading enzymes would likely be to prevent transfer of DNA by
Options- A. conjugal transfer by a self-transmissible plasmid
- B. generalized phage transduction
- C. natural transformation
- D. none of the above Discuss
Correct Answer: natural transformation
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