题目内容

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;

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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.

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Which antibiotics can not be inactivated by beta- lactamase produced by bacteria?

A. penicillin,
B. streptomycin,
C. vacomycin,
D. Cephalosporin.

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Which type of point mutation in chromosomal gene is less likely to alter pore proteins to prevent the entry of drug into cytoplasm.

A. silent mutation;
B. missense mutation,
C. nonsense mutation;
D. Frameshift insertion.

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Which protein with mutations in its gene could not inducedrug resistance?

A. porin in the outer membrane;
B. P12 of 30S ribosome ,
C. β-unit of RNA polymerase ;
D. lipoprotein in cell wall.

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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?

Which antibiotics can not be inactivated by beta- lactamase produced by bacteria?

Which type of point mutation in chromosomal gene is less likely to alter pore proteins to prevent the entry of drug into cytoplasm.

Which protein with mutations in its gene could not inducedrug resistance?

A. DNA polymerase;
B. The enzymes can inactivate the antibiotics.
C. RNA polymerase;
D. Gyrase;