True/False: A) A bacterium is resistant to bacteriostatic antibiotic when the an

Question

True/False:
A) A bacterium is resistant to bacteriostatic antibiotic when the antibiotic does not inhibit growth___
B) when using the disk diffusion method to test for susceptibility to antibiotics, in general, the greater the some of inhibition, the more susceptible the organism ___
C) Antibiotics susceptibility testing is performed on pure cultures of pathogens isolated from patients to determine which drugs are more likely to be effective in treating the infection ____
D) In the Kirby-Bauer disk diffusion method, the test bacterium is spread on the agar surface followed by the application of paper disks impregnated with antibiotic drugs ____ True/False:
A) A bacterium is resistant to bacteriostatic antibiotic when the antibiotic does not inhibit growth___
B) when using the disk diffusion method to test for susceptibility to antibiotics, in general, the greater the some of inhibition, the more susceptible the organism ___
C) Antibiotics susceptibility testing is performed on pure cultures of pathogens isolated from patients to determine which drugs are more likely to be effective in treating the infection ____
D) In the Kirby-Bauer disk diffusion method, the test bacterium is spread on the agar surface followed by the application of paper disks impregnated with antibiotic drugs ____
A) A bacterium is resistant to bacteriostatic antibiotic when the antibiotic does not inhibit growth___
B) when using the disk diffusion method to test for susceptibility to antibiotics, in general, the greater the some of inhibition, the more susceptible the organism ___
C) Antibiotics susceptibility testing is performed on pure cultures of pathogens isolated from patients to determine which drugs are more likely to be effective in treating the infection ____
D) In the Kirby-Bauer disk diffusion method, the test bacterium is spread on the agar surface followed by the application of paper disks impregnated with antibiotic drugs ____

Explanation / Answer

A. True

A bacteriostatic antibiotic inhibits growth by interfering with vital cellular processess of bacteria like translation, replication or cellular metabolism. So a bacterium is resistant to bacteriostatic antibiotic when the antibiotic fails to inhibit its growth.

B. True

The zone of inhibition is measured.It is then compared to a database of zone standards to determine the succeptibility of the bacterium in question.The bacterium being studied is then classified as susceptible, moderately susceptible or resistant to the antibiotic.

C. False

Antibiotics susceptibility testing is performed on blood samples, sputum or urine sample isolated from patients which might not be pure cultures of pathogens. This can help in diagnosis of the diseases or pathogens present in a patient.

D. True

In this method, wafers containing antibiotics are placed on an agar plate containing bacteria, and the plate is left to incubate. If an antibiotic is bacteriostatic or bactericidal , zone of inhibition will be observed around which there will be no visible growth of bacteria.

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