Prelab Quiz 10

Question 1

What is a disinfectant ?

Answer 1

Antimicrobial agents used on inanimate objects

Question 2

What is an antiseptic?

Answer 2

Antimicrobial agents used on living tissues such as skin, and throat mucosa

Question 3

What is the difference between an antiseptic and a disinfectant?

Answer 3

Additional answer*

Sometimes the difference is just a matter of concentration

Question 4

The type of test we used with the paper disks dipped in a chemical then placed on a lawn of bacteria is called ?

Answer 4

disk diffusion test/Kirby Bauer test

Question 5

The rate of diffusion of a chemical depends on

Answer 5

The concentration of the chemical on the disk

Question 6

The standardized test we used to compare the efficacy of antibiotics is called ?

Answer 6

Kirby-Bauer Test

Question 7

What is the zone of inhibition ?

Answer 7

The immediate area around the disk with no growth

Question 8

How is a zone of inhibition measured?

Answer 8

Diameter of zone is measured and compared to values from a standardized chart

Question 9

T/F all Antimicrobial chemicals kill all microbes

Answer 9

False, cannot kill certain viruses, fungal and bacterial spores.

Question 10

What are some factors that might affect the effectiveness of the speed of a disinfectant?

Answer 10

-Concentration of Antimicrobial agent
-duration and temp of exposure
-kinds of microorganisms present
-number of microorganisms present
-presence of organic matter like blood, feces or sputum