Question 1

Which of the following best describes the mechanism by which moist heat kills microorganisms?

Accepted Answer

It denatures proteins and destroys cytoplasmic membranes.

Question 2

A hospital is deciding between using phenol and a new disinfectant. The phenol coefficient for the new disinfectant is 1.5. What does this indicate?

Accepted Answer

The new disinfectant is more effective than phenol.

Question 3

Which of the following organisms is most resistant to antimicrobial agents?

Accepted Answer

Prions

Question 4

A laboratory technician needs to sterilize a heat-sensitive solution. Which method is most appropriate?

Accepted Answer

Filtration through a membrane filter

Question 5

Which of the following statements about quaternary ammonium compounds (quats) is correct?

Accepted Answer

They are low-level disinfectants suitable for many medical applications.

Question 6

A food processing plant wants to extend the shelf life of strawberries. Which physical method would be most effective?

Accepted Answer

Ionizing radiation

Question 7

Which of the following best explains why slow freezing is more effective than quick freezing for microbial control?

Accepted Answer

Slow freezing causes more ice crystals to form, which can puncture cell membranes.

Question 8

Which of the following is NOT a desirable property of an ideal antimicrobial agent?

Accepted Answer

Requires high temperatures to be effective

Question 9

A solution is described as bacteriostatic. What does this mean?

Accepted Answer

It inhibits the growth of bacteria without killing them.

Question 10

Which of the following best describes the decimal reduction time (D-value) in microbial control?

Accepted Answer

The time required to reduce a microbial population by 90% at a given temperature.

Question 11

Which of the following is a limitation of using hydrogen peroxide as an antiseptic for open wounds?

Accepted Answer

It is inactivated by catalase present in tissues.

Question 12

Which biosafety level (BSL) is required for handling microbes that cause severe or fatal diseases for which there are no available vaccines or treatments?

Accepted Answer

BSL-4

Question 13

A researcher is using a Kelsey-Sykes capacity test. What is being measured?

Accepted Answer

The minimum time required for a disinfectant to be effective.

Question 14

Which of the following is the ultimate means of sterilization?

Accepted Answer

Incineration

Question 15

Why are nonenveloped viruses generally more resistant to disinfectants than enveloped viruses?

Accepted Answer

They lack a lipid envelope, making them less susceptible to agents targeting membranes.

Question 16

Which of the following is a real-world application of osmotic pressure for microbial control?

Accepted Answer

Preserving jams and salted meats

Question 17

Which chemical method is used to remove prions from medical instruments?

Accepted Answer

Prionzyme

Question 18

A nurse swabs a patient’s skin with 70% ethanol before an injection. This is an example of which process?

Accepted Answer

Degerming

Question 19

Which of the following statements about aldehydes is correct?

Accepted Answer

They cross-link functional groups to denature proteins and inactivate nucleic acids.

Question 20

Which of the following best explains why the use of antiseptic and disinfectant chemicals can promote the development of resistant microbes?

Accepted Answer

Surviving microbes may possess or develop resistance mechanisms, which are then selected for.

Microbial Control: Principles, Methods, and Applications

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