Question 1

Which of the following surfaces in a car is likely to have the highest average number of colony-forming units (CFUs) per 6.5 x 6.5 cm area, based on real-world studies?

Accepted Answer

Center console

Question 2

Which microbial control method is defined as the destruction or removal of vegetative pathogens but not bacterial endospores, and is usually used only on inanimate objects?

Accepted Answer

Disinfection

Question 3

A hospital needs to sterilize surgical instruments that cannot withstand high temperatures. Which method is most appropriate?

Accepted Answer

High-level chemical germicide

Question 4

Which of the following is the most resistant to microbial control agents?

Accepted Answer

Bacterial endospores

Question 5

Which physical method of microbial control works by causing the formation of pyrimidine dimers in DNA, thereby interfering with replication?

Accepted Answer

Non-ionizing radiation (UV light)

Question 6

Which equation best describes the exponential decrease in microbial population during death curve analysis?

Accepted Answer

$$N_t = N_0$ e$$^{-kt}$$

Question 7

Which of the following is NOT a factor that affects the rate of microbial death?

Accepted Answer

Color of the microbes

Question 8

Which chemical agent works by dissolving membrane lipids and coagulating proteins, and is commonly found in hand sanitizers?

Accepted Answer

Alcohols

Question 9

A laboratory technician needs to sterilize a heat-sensitive liquid. Which method should be used?

Accepted Answer

Filtration

Question 10

Which of the following statements about pasteurization is TRUE?

Accepted Answer

It reduces the number of non-spore-forming pathogens in food

Question 11

Which of the following is an example of a bacteriostatic agent?

Accepted Answer

Refrigeration at $$4^	ext{\circ}C$$

Question 12

Which chemical agent disrupts cell walls and membranes and precipitates proteins, and was historically used by Joseph Lister for surgical wound treatment?

Accepted Answer

Phenol

Question 13

Which of the following is a correct application of the term 'degermation'?

Accepted Answer

Using water and mechanical scrubbing to remove microbes from skin

Question 14

Which of the following is NOT considered an antiseptic or disinfectant, but is effective at mechanically removing microbes from surfaces?

Accepted Answer

Soap

Question 15

Which of the following is a desirable quality of a germicide for use in healthcare settings?

Accepted Answer

Broad spectrum and low toxicity

Question 16

Which of the following methods is most effective for sterilizing large volumes of medical waste in an animal laboratory?

Accepted Answer

Incineration

Question 17

Which chemical agent produces reactive oxygen species that damage proteins and DNA, and is used to clean wounds?

Accepted Answer

Hydrogen peroxide

Question 18

Which of the following is a correct statement about the use of boiling water for microbial control?

Accepted Answer

Boiling water is effective against non-spore-forming pathogens

Question 19

Which of the following is the correct order of microbial resistance to control agents, from most resistant to least resistant?

Accepted Answer

Bacterial endospores \u003e Mycobacterium \u003e Gram-negative bacteria \u003e Enveloped viruses

Question 20

Which of the following is a real-world example of sanitization?

Accepted Answer

Washing dishes with hot water

Unit 13 Micro

Study Guide - Practice Questions

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