12-17-2005, 03:25 PM
Resistance to tetracycline is a common trait in bacteria largely due to the fact that tetracycline is used to promote weight gain in beef cattle and it is an over-the-counter drug in most third world countries. Therefore many different mechanisms of resistance to tetracycline have evolved in the bacteria. What is not a mechanism of resistance to tetracycline?
A. Efflux of tetracycline from the cell by a specific transport protein
B. A mutation in the porins of the outer membrane which prevents the influx of tetracycline
C. Production of an additional protein, which protects the site on the ribosome to which tetracycline, binds
D. Modification of tetracycline by a specific enzyme that inactivates it
A. Efflux of tetracycline from the cell by a specific transport protein
B. A mutation in the porins of the outer membrane which prevents the influx of tetracycline
C. Production of an additional protein, which protects the site on the ribosome to which tetracycline, binds
D. Modification of tetracycline by a specific enzyme that inactivates it