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1The zone of inhibition that is formed during the disc diffusion susceptibility test is dependent on many factors. Which of the following choices is not one of the factors discussed that the zone of inhibition is dependent on?
A)The molecular weight of the antimicrobic.
B)The pH of the antimicrobic.
C)The type of media.
D)The concentration of the bacterial culture.


2The 11 McFarland standards represent a specific degree of turbidity. What is the degree of turbidity used for?
A)To visually standardize the growth of bacterial cultures.
B)To visually standardize the pH of bacterial cultures.
C)To visually standardize the level of antimicrobic resistance.
D)To visually standardize the growth factors available to the bacterial cultures.


3The Kirby-Bauer method of antimicrobic testing was performed on a Haemophilus culture. A disc on the plate contained ampicillin at a concentration of 10 μg and the zone of inhibition was 19mm. A disc on the plate contained ciprofloxacin at a concentration of 5 μg and the zone of inhibition was 20 mm. A disc on the plate contained loracarbef at a concentration of 30 μg and the zone of inhibition was 21 mm. A disc on the plate contained tetracycline at a concentration of 30 μg and the zone of inhibition was 26 mm. Based on this information which antimicrobic would the most effective choice for chemotherapy.
A)Ampicillin
B)Ciprofloxacin
C)Loracarbef
D)Tetracycline


4Which of the following antimicrobic tests determine the concentration of antimicrobic that is appropriate?
A)Kirby Bauer test and Tube dilution test
B)Tube dilution test and E-test
C)E-test and Kirby Bauer test
D)Kirby Bauer test, Tube dilution test and E-test


5In the E-test, the zone of inhibition is elliptical around the plastic strips impregnated with antibiotics. What information do you get when you know the point at which the bacterial growth touches the strip?
A)You know the concentration of a chemical that bacteria are resistant to.
B)You know the concentration of a chemical that slightly diminishes microbial growth.
C)You know the concentration of a chemical that completely inhibits microbial growth





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