Which one of the following structures is encoded by the RTF of R plasmid?
A. peptidoglycan,
B. lipoprotein,
C. flagellum.
D. Sex Pili,
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Which type of gene transfer associated with spread of drug resistance is determined by RTF of R plasmid?
A. conjugation
B. transduction
C. transformation,
D. Lysogenic conversion
Which one might be encoded by the R determinants of R plasmid?
A. DNA polymerase;
B. The enzymes can inactivate the antibiotics.
C. RNA polymerase;
D. Gyrase;
Which statement about beta- lactamases is not right?
About 200 different lactamases identified ;
B. They can break the beta- lactam ring of the antibiotics ;
C. Most enzymes are encoded by the genes in the chromosome frequently;
D. They can spread among bacteria by horizontal gene transfer.
Which antibiotics can not be inactivated by beta- lactamase produced by bacteria?
A. penicillin,
B. streptomycin,
C. vacomycin,
D. Cephalosporin.
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