Microbiology Disinfection Methods Quiz

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What type of radiation is considered a form of cold sterilization?

Ultraviolet Rays
Beta Rays
Infrared Rays
Gamma Rays (correct)

Which of the following is NOT a characteristic of HEPA filters?

Works only for liquid applications (correct)
Traps small, harmful particles
Requires frequent replacement
Uses electrostatic attraction for filtration

What is the primary action of chemical agents like chlorine dioxide gas?

Inhibits protein synthesis
Releases free radicals
Decomposes organic matter
Sterilizes medical equipment and surfaces (correct)

Which chemical agent is an example of a phenolic compound used in disinfection?

Triclosan (D) Signup and view all the answers

Which factor does NOT affect the germicidal activity of chemical agents?

Color of the liquid solution (C) Signup and view all the answers

What is the standard mode of action for nonionizing radiation like ultraviolet rays?

Forms pyrimidine dimers (A) Signup and view all the answers

What is an important consideration when using liquid disinfectants such as iodine?

They can damage human tissues (B) Signup and view all the answers

What is the primary function of filters in liquid applications?

To remove specific contaminants based on pore size (C) Signup and view all the answers

What is the primary function of Betapropiolactone?

To inactivate viruses (B) Signup and view all the answers

What action do quaternary ammonium compounds commonly perform?

They serve as detergents and disinfectants (C) Signup and view all the answers

Which group of antimicrobial agents is known for blocking cell wall synthesis?

Penicillin and its relatives (B) Signup and view all the answers

What is the main mechanism of action for rifampin in antimicrobial therapy?

To block RNA synthesis (C) Signup and view all the answers

Which of the following compounds exerts lethality upon microorganisms in extremely small amounts?

Oligodynamic compounds (C) Signup and view all the answers

What is the role of aminoglycosides in antimicrobial therapy?

Interfere with protein synthesis (C) Signup and view all the answers

Which drug is known as an antimetabolite that blocks metabolic pathways?

Trimethoprim (A) Signup and view all the answers

What type of action do phenol compounds typically exhibit in antimicrobial applications?

Cell membrane disruption (B) Signup and view all the answers

What is the primary purpose of a germicide?

To kill pathogens (C) Signup and view all the answers

Which of the following methods is most effective for sterilization using moist heat?

Autoclaving (D) Signup and view all the answers

How does dry heat sterilization primarily differ from moist heat sterilization?

Dry heat requires longer exposure times (B) Signup and view all the answers

What is the main effect of refrigeration on microorganisms?

It inhibits their growth (C) Signup and view all the answers

In which scenario would dry heat ovens typically be used for sterilization?

Sterilizing metal and glass instruments (B) Signup and view all the answers

Which of the following is a key factor that affects the death rate of microorganisms?

Activity of the antimicrobial agent (C) Signup and view all the answers

What is the principle of pasteurization?

To increase the temperature for a short duration (A) Signup and view all the answers

What is the effect of desiccation on microorganisms?

It inhibits growth by removing water (D) Signup and view all the answers

Lyophilization

A method of preserving substances by freezing and removing water using sublimation.

Ionizing Radiation

High-energy radiation (gamma rays, X-rays) that causes significant damage to microbes' DNA, leading to sterilization.