Which mechanism will confer sulfonamide resistance in thebacteria?
A. Bacteria absorb folic acid from the environment;
Bacteria alter P12 of 30S ribosome ,
C. Bacteria with mutatedβ-unit of RNA polymerase ;
D. Bacteria produce beta-lactamases.
查看答案
Which statement about efflux pumps of bacteria is not right?
An efflux pump is a membrane active protein.
B. An efflux pump works without consumption of ATP.
C. Efflux pumps can pump more than one type of antimicrobials out of a cell.
D. Efflux pumps can confer multi-drug resistance to bacteria.
Which is not the biochemical mechanisms of antibiotics-resistance?
A. Barriers formed to block accumulation of antibiotics in bacterial cells;
Bacteria produce enzymes which can break the structures of antibiotics;
C. The bacterial molecules surround the antibiotics of penetrating the cells;
D. Bacterial Ribosome protein mutated so that antibiotics can not bind them.
Which molecule mutated or decreased at level will develop drug-resistance?
A. peptidoglycan,
B. hemolysin
C. Protein porin channels in outer membrane
D. M protein in the cell wall.
Which mutation in the gene for the following molecule may not be responsible for antibiotics-resistance ?
A. β-unit of RNA polymerase,
B. lipoprotein
C. P12 of 30S subunit of ribosome
D. Protein porin channels in outer membrane .
微信支付 
支付宝支付