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MCQs

Total Questions : 82 | Page 3 of 9 pages
Question 21. When composite transposons are formed
  1.    a small deletion occurs in the transposase gene of an IS element
  2.    an IS element integrates with another IS element with the help of a plasmid
  3.    a small deletion occurs in the transposase gene of an IS element and plasmid is integrated
  4.    two IS elements integrate into a chromosome with only a small distance separating them
 Discuss Question
Answer: Option D. -> two IS elements integrate into a chromosome with only a small distance separating them
Question 22. Which of the following plamids do not possess information for self transfer to another cell?
  1.    None of these
  2.    Non-conjugative plasmids
  3.    Conjugative plasmids
  4.    Cryptic plasmids
 Discuss Question
Answer: Option B. -> Non-conjugative plasmids
Question 23. The term used for acquisition of naked DNA from its environment and its incorporation in their genome by a bacterium is
  1.    conjugation
  2.    lysogenic conversion
  3.    transformation
  4.    transduction
 Discuss Question
Answer: Option C. -> transformation
Question 24. What is term used for a bacterial cell that is able to take up naked DNA?
  1.    Liable
  2.    Complementary
  3.    Infected
  4.    Competent
 Discuss Question
Answer: Option D. -> Competent
Question 25. Penicillin resistance in staphylococci is acquired due to
  1.    mutation
  2.    transformation
  3.    conjugation
  4.    transduction
 Discuss Question
Answer: Option D. -> transduction
Question 26. Plasmid that carries genes encoding enzymes, which degrade substances such as aromatic compounds, pesticides or sugar are
  1.    none of these
  2.    metabolic plasmid
  3.    virulence plasmid
  4.    F factors
 Discuss Question
Answer: Option B. -> metabolic plasmid
Question 27. The plasmid which makes the host more pathogenic is
  1.    Metabolic plasmid
  2.    F factors
  3.    Virulence plasmid
  4.    None of these
 Discuss Question
Answer: Option C. -> Virulence plasmid
Question 28. The correct term for the transfer of genetic material between bacteria in direct physical contact is
  1.    transduction
  2.    transformation
  3.    replication
  4.    conjugation
 Discuss Question
Answer: Option D. -> conjugation
Question 29. The expression of gene X (which has promoter Px) is to be monitored. A gene fusion construction for carrying this work will
  1.    allow to monitor the expression of all genes with a promoter similar in sequence to Px
  2.    give the same information as from a microarray
  3.    have Px but not the rest of the X coding region
  4.    have the promoter of lacZ or some other reporter gene
 Discuss Question
Answer: Option C. -> have Px but not the rest of the X coding region
Question 30. The transducing particles carry only specific portions of the bacterial genome in which of the following transduction?
  1.    None of these
  2.    Specialized transduction
  3.    General transduction
  4.    Abortive transduction
 Discuss Question
Answer: Option B. -> Specialized transduction

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