Microbial Recombination and Gene Transfer – Section 1

21. When composite transposons are formed

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

Correct Answer: D. two IS elements integrate into a chromosome with only a small distance separating them

22. Which of the following plasmids do not possess information for self-transfer to another cell?

A. Cryptic plasmids
B. Conjugative plasmids
C. Non-conjugative plasmids
D. None of these

Correct Answer: C. Non-conjugative plasmids

23. The term used for acquisition of naked DNA from its environment and its incorporation in their genome by a bacterium is

A. transformation
B. lysogenic conversion
C. conjugation
D. transduction

Correct Answer: A. transformation

24. What is the term used for a bacterial cell that is able to take up naked DNA?

A. Complementary
B. Liable
C. Competent
D. Infected

Correct Answer: C. Competent

25. Penicillin resistance in staphylococci is acquired due to

A. conjugation
B. mutation
C. transformation
D. transduction

Correct Answer: D. transduction

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