Chapter 7 Quiz

Which of the following pairs of terms is mismatched? a. bacteriostatic — kills vegetative bacterial cells b. germicide — kills microbes c. virucide — inactivates viruses d. sterilant — destroys all living microorganisms e. fungicide — kills yeasts and molds

a. Bacteriostatic — kills vegetative bacterial cells

An agent used to reduce the number of bacteria on a toilet would most accurately be called a(n): a. disinfectant. b. antiseptic. c. aseptic. d. fungicide. e. virucide.

a. disinfectant

Which concentration of ethanol is the most effective bactericide? a. 100 percent b. 70 percent c. 50 percent d. 40 percent e. 30 percent

b. 70 percent

A disk-diffusion test using Staphylococcus gave the following results: Disinfectant Zone of inhibition (mm) A 0 B 2.5 C 10 D 5 In the table above, which compound was the most effective against Staphylococcus? a. A b. B c. C d. D e. The ANSWER cannot be determined based on the information provided.

c. C

Which of the following methods is used to preserve food by slowing the metabolic processes of foodborne microbes? a. lyophilization b. nonionizing radiation c. freezing d. ionizing radiation e. pasteurization

c. Freezing

Which of the following is the best method to sterilize heat-labile solutions? a. dry heat b. autoclave c. membrane filtration d. pasteurization e. freezing

c. Membrane filtration

All of the following are methods of food preservation EXCEPT: a. desiccation. b. high pressure. c. ionizing radiation. d. microwaves. e. osmotic pressure.

d. Microwaves

Which of the following regarding antimicrobial control agents is FALSE? a. Contaminating organic debris such as blood or sputum will decrease effectiveness. b. Some agents kill by denaturing microbial cell proteins. c. Some agents affect microbial cell membranes by dissolving lipids. d. Some agents are utilized as both an antiseptic and a disinfectant. e. A true antimicrobial control agent is equally effective against both bacteria and viruses.

e. A true antimicrobial control agent is equally effective against both bacteria and viruses.

An iodophor is a(n): a. phenol. b. agent that reduces oxygen. c. quaternary ammonium compound. d. form of formaldehyde. e. iodine mixed with a surfactant.

e. Iodine mixed with a surfactant.