5.5.2: Fill-In-The-Blank

1. The Kirby-Bauer method requires a special media called agar.

2. Microorganisms that grow best in environments with less than pH 5.5 are called .

3. A clear zone showing no microbial growth around a filter disc with a drug or antimicrobial agent is a .

4. Bacteria that do not grow in temperatures above 20˚C are called .

5. When performing a Kirby-Bauer test, an organism is said to be to an antimicrobial drug if higher than normal concentrations are needed to inhibit the microbe.

6. Chemical agents that act only to inhibit the growth of microorganisms are .

7. are chemical agents that are used to reduce microbial numbers on living tissues.

8. pH is a measurement of the concentration of ions in a sample or environment.

9. Changes in pH can interrupt bonds, which may cause proteins to permanently.

10. The most resistant form of microorganism is the .

11. viruses are considered more resistant to chemical agents because they lack a lipid envelope.

12. Methods capable of killing all forms of microorganisms are known as methods.

13. occurs when a microorganism is not inhibited or killed by an antimicrobial drug.

14. The bacterial culture is swabbed repeatedly over the surface of the agar in order to create a of growth.