Question 1

Which of the following best describes the process of sterilization?

Accepted Answer

The destruction or removal of all viable microorganisms, including endospores.

Question 2

A hospital instrument that will be used in surgery must be treated with which level of germicide?

Accepted Answer

High-level germicide

Question 3

Which microbial structure is most resistant to physical and chemical control methods?

Accepted Answer

Bacterial endospores

Question 4

A nurse uses hand sanitizer before treating a patient. This is an example of:

Accepted Answer

Antisepsis

Question 5

Which of the following methods is NOT effective at achieving sterilization?

Accepted Answer

Boiling water at 100°C for 30 minutes

Question 6

Pasteurization is designed to:

Accepted Answer

Reduce the number of non-spore-forming pathogens without destroying food quality

Question 7

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

Accepted Answer

$N_t = N_0 	imes 10^{-kt}$

Question 8

A chemical agent that disrupts cell walls and membranes and precipitates proteins is most likely a:

Accepted Answer

Phenolic compound

Question 9

Which physical method of microbial control is most suitable for sterilizing heat-sensitive liquids?

Accepted Answer

Filtration

Question 10

Which of the following factors does NOT affect the rate of microbial death?

Accepted Answer

Color of the microorganism

Question 11

A microbiologist wants to sterilize a loop before inoculating bacteria. Which method is most appropriate?

Accepted Answer

Incineration

Question 12

Which of the following is a correct statement about soaps?

Accepted Answer

Soaps mechanically remove microbes but do not kill or inhibit them.

Question 13

Which chemical agent works by producing reactive oxygen species that damage proteins and DNA?

Accepted Answer

Hydrogen peroxide

Question 14

A food manufacturer wants to preserve bacteria for future use. Which method should be used?

Accepted Answer

Lyophilization (freeze drying)

Question 15

Which of the following is a correct application of intermediate-level germicides?

Accepted Answer

Disinfecting devices that contact mucous membranes but are not invasive

Question 16

Which of the following statements about microbial death is TRUE?

Accepted Answer

Microbial death is determined by the permanent loss of reproductive capability under optimal conditions.

Question 17

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

Accepted Answer

Washing dishes with hot water

Question 18

Which chemical agent is most likely to alkylate proteins and nucleic acids?

Accepted Answer

Aldehydes

Question 19

Which physical method of microbial control is microbistatic rather than microbicidal?

Accepted Answer

Refrigeration

Question 20

A laboratory technician uses UV light to disinfect surfaces. What is the primary mode of action?

Accepted Answer

Formation of pyrimidine dimers in DNA, interfering with replication

Chapter 13: Control of Microbial Growth – Study Notes

Study Guide - Practice Questions