Question 1

Which of the following best describes the process of sterilization?

Accepted Answer

The removal of all microorganisms, including endospores and viruses, from an item.

Question 2

Joseph Lister revolutionized surgery by introducing which of the following practices?

Accepted Answer

Applying carbolic acid (phenol) directly onto damaged tissues and sterilizing instruments.

Question 3

Which of the following statements about disinfection is correct?

Accepted Answer

Some viable microbes may remain after disinfection.

Question 4

A hospital is preparing surgical instruments for use. Which level of microbial control is required for these instruments?

Accepted Answer

Sterilization

Question 5

Which of the following is a limitation of using alcohols as germicidal agents?

Accepted Answer

They evaporate quickly, limiting contact time.

Question 6

Which of the following best explains why boiling is not a reliable method of sterilization?

Accepted Answer

Boiling does not destroy bacterial endospores.

Question 7

A food processing facility wants to ensure that Clostridium botulinum endospores are destroyed in canned foods. Which process should they use?

Accepted Answer

Commercial canning using a retort (industrial autoclave)

Question 8

Which of the following statements about prions is correct?

Accepted Answer

Prions are not considered in standard sterilization protocols.

Question 9

Which of the following is a reason why hand washing with soap and water is effective in daily life?

Accepted Answer

Soap aids in the mechanical removal of organisms from the skin.

Question 10

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

Accepted Answer

The time required to kill 90% of a microbial population under specific conditions.

Question 11

Which of the following is a key reason why Mycobacterium species are resistant to many chemical treatments?

Accepted Answer

They have waxy cell walls.

Question 12

A laboratory is working with a lethal pathogen for which no vaccine or treatment exists. According to CDC guidelines, which biosafety level (BSL) is required?

Accepted Answer

BSL-4

Question 13

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

Accepted Answer

Chlorine can react with organic compounds to form disinfection by-products (DBPs) linked to health risks.

Question 14

Which of the following chemical agents is most appropriate for sterilizing heat- and moisture-sensitive medical equipment such as pacemakers?

Accepted Answer

Ethylene oxide gas

Question 15

Which of the following statements about high-level disinfectants is correct?

Accepted Answer

They destroy viruses and vegetative cells but do not reliably kill endospores.

Question 16

Which of the following best explains why filtration is used to sterilize heat-sensitive fluids?

Accepted Answer

Filtration physically removes microorganisms without exposing fluids to high temperatures.

Question 17

Which of the following is a major advantage of using peroxygens (such as hydrogen peroxide) as sterilants?

Accepted Answer

They are readily biodegradable and leave no residue.

Question 18

A food manufacturer wants to preserve fruit by reducing available water. Which method is most effective for this purpose?

Accepted Answer

Adding salt or sugar to increase environmental solute concentration.

Question 19

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

Accepted Answer

They destroy vegetative bacteria and enveloped viruses by reacting with membranes.

Question 20

Which of the following is a reason why some bacteria, such as Pseudomonas species, are difficult to eliminate from hospital environments?

Accepted Answer

They can actually grow in some disinfectant solutions.

Control of Microbial Growth: Principles and Approaches

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