Question 1

Which of the following best describes the process of sterilization as used in a hospital autoclave (as shown in the second image)?

Accepted Answer

The removal and destruction of all microbial life, including endospores.

Question 2

A disinfectant spray (such as the one shown in the third image) is used on a kitchen counter. Which of the following statements is correct regarding its action?

Accepted Answer

It destroys harmful microorganisms but may not eliminate all endospores.

Question 3

Which term describes the use of an alcohol swab on the skin prior to an injection?

Accepted Answer

Degerming

Question 4

Why is the logarithmic plotting of the microbial death curve (as shown in the sixth image) preferred over arithmetic plotting?

Accepted Answer

It allows for easier calculation of the decimal reduction time (DRT).

Question 5

Which of the following is the best example of antisepsis?

Accepted Answer

Applying iodine solution to a wound on the skin.

Question 6

A hospital uses glutaraldehyde to sterilize heat-sensitive equipment. What is the main advantage of glutaraldehyde over other chemical disinfectants?

Accepted Answer

It is one of the few liquid chemical sterilizing agents effective against endospores.

Question 7

Which physical method is most appropriate for sterilizing a heat-sensitive vitamin solution?

Accepted Answer

Filtration through a membrane filter with pore size $$0.22\ \mu m$$

Question 8

Which of the following statements about pasteurization is correct?

Accepted Answer

It reduces spoilage organisms and pathogens without significantly altering the taste of the product.

Question 9

A can of pork takes longer to sterilize than a can of soup with pork pieces at the same temperature. Why?

Accepted Answer

Solid pork has less surface area for heat transfer compared to soup.

Question 10

Which of the following chemical agents is most effective against endospores?

Accepted Answer

Glutaraldehyde

Question 11

Which of the following best explains why gram-negative bacteria are generally more resistant to chemical biocides than gram-positive bacteria?

Accepted Answer

Their outer membrane acts as a barrier to many chemicals.

Question 12

Which of the following is a correct statement about the use-dilution test?

Accepted Answer

It is used to determine the minimum concentration of disinfectant needed to kill bacteria on surfaces.

Question 13

Which of the following is NOT a method by which microbial control agents damage cells?

Accepted Answer

Inhibiting cell wall synthesis

Question 14

Which of the following statements about alcohols as disinfectants is correct?

Accepted Answer

They require water to be effective.

Question 15

Which of the following best describes the action of quaternary ammonium compounds (quats)?

Accepted Answer

They are cationic detergents that disrupt plasma membranes and denature proteins.

Question 16

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

Accepted Answer

Preserving fruit juices without altering their flavor.

Question 17

Which of the following statements about ionizing radiation is correct?

Accepted Answer

It kills microbes by causing lethal mutations in DNA.

Question 18

Which of the following is the best example of sanitization?

Accepted Answer

Using a high-heat dishwasher to clean eating utensils in a restaurant.

Question 19

Which of the following is a limitation of using chlorine as a disinfectant?

Accepted Answer

It can be inactivated by organic matter.

Question 20

Which of the following best describes the action of aldehydes as chemical control agents?

Accepted Answer

They denature proteins by cross-linking functional groups.

Chapter 7: The Control of Microbial Growth – Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards