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Microbiology, 2021

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554 13 • Review Questions<br />

was calculated.<br />

• The disk-diffusion method is used to test the<br />

effectiveness of a chemical disinfectant against<br />

a particular microbe.<br />

• The use-dilution test determines the<br />

REVIEW QUESTIONS<br />

Multiple Choice<br />

1. Which of the following types of medical items<br />

requires sterilization?<br />

A. needles<br />

B. bed linens<br />

C. respiratory masks<br />

D. blood pressure cuffs<br />

2. Which of the following is suitable for use on<br />

tissues for microbial control to prevent infection?<br />

A. disinfectant<br />

B. antiseptic<br />

C. sterilant<br />

D. water<br />

3. Which biosafety level is appropriate for research<br />

with microbes or infectious agents that pose<br />

moderate risk to laboratory workers and the<br />

community, and are typically indigenous?<br />

A. BSL-1<br />

B. BSL-2<br />

C. BSL-3<br />

D. BSL-4<br />

4. Which of the following best describes a microbial<br />

control protocol that inhibits the growth of molds<br />

and yeast?<br />

A. bacteriostatic<br />

B. fungicidal<br />

C. bactericidal<br />

D. fungistatic<br />

5. The decimal reduction time refers to the amount<br />

of time it takes to which of the following?<br />

A. reduce a microbial population by 10%<br />

B. reduce a microbial population by 0.1%<br />

C. reduce a microbial population by 90%<br />

D. completely eliminate a microbial population<br />

6. Which of the following methods brings about cell<br />

lysis due to cavitation induced by rapid localized<br />

pressure changes?<br />

A. microwaving<br />

B. gamma irradiation<br />

C. ultraviolet radiation<br />

D. sonication<br />

effectiveness of a disinfectant on a surface. Inuse<br />

tests can determine whether disinfectant<br />

solutions are being used correctly in clinical<br />

settings.<br />

7. Which of the following terms is used to describe<br />

the time required to kill all of the microbes<br />

within a sample at a given temperature?<br />

A. D-value<br />

B. thermal death point<br />

C. thermal death time<br />

D. decimal reduction time<br />

8. Which of the following microbial control methods<br />

does not actually kill microbes or inhibit their<br />

growth but instead removes them physically<br />

from samples?<br />

A. filtration<br />

B. desiccation<br />

C. lyophilization<br />

D. nonionizing radiation<br />

9. Which of the following refers to a disinfecting<br />

chemical dissolved in alcohol?<br />

A. iodophor<br />

B. tincture<br />

C. phenolic<br />

D. peroxygen<br />

10. Which of the following peroxygens is widely<br />

used as a household disinfectant, is<br />

inexpensive, and breaks down into water and<br />

oxygen gas?<br />

A. hydrogen peroxide<br />

B. peracetic acid<br />

C. benzoyl peroxide<br />

D. ozone<br />

11. Which of the following chemical food<br />

preservatives is used in the wine industry but<br />

may cause asthmatic reactions in some<br />

individuals?<br />

A. nitrites<br />

B. sulfites<br />

C. propionic acid<br />

D. benzoic acid<br />

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