Bi 234 Exam 3 Review Fall 2025

Which of the following is considered the most susceptible to antimicrobial agents?

• Bacterial endospores

• Gram-positive bacteria

• enveloped viruses

• non-enveloped viruses

• Fungi

This term refers to the use of physical of chemical agents including UV light, heat, alcohol, and bleach to treat inanimate objects:

(a)  

Which of the following describes desiccation? (Check ALL that apply.)

• It inhibits microbial growth because metabolism requires liquid water.

• It is a technique that combines freezing and drying.

• It is a physical method of microbial control that prevents most pathogens from growing by keeping them between 1-7 degrees Celsius.

• It has been used for thousands of years to preserve foods.

• It is a physical method of microbial control that heats objects to 171 degrees Celsius for 1 hour.

Which of the following are examples of nonionizing radiation? (Check ALL that apply.)

• Electron beams

• UV light

• Visible light

• X rays

• Radio waves

Tags

NGSS.HS-PS4-4

Iodine, chlorine, bromine, and fluorine constitute this chemical method of microbial control:

(a)  

A specific type of surfactant known as a Quat is a synthetic detergent that disrupts cellular members and is bactericidal, fungicidal, and virucidal. What does the term Quat stand for?

(a)  

Define the term selective toxicity:

Answer explanation

An effective antimicrobial agent must be more toxic to a pathogen than to the pathogen's host.

What is the mode of action for Azoles?

• Inhibit peptidoglycan formation by irreversibly binding to the enzymes that cross-link NAM subunits.

• Inhibit alanine-alanine bridges that link NAM subunits in peptidoglycan.

• Target the 30S subunit of the ribosome preventing translation.

• Target the 50S subunit of the ribosome preventing translation.

• Inhibit the synthesis of ergosterol in fungal cell walls.

To test antimicrobial agents, an Etest may be used which combines aspects of the following tests:

(a)  

Aldehydes are compounds containing terminal -CHO groups and are considered ________ level antimicrobial agents.

• High

• Intermediate

• Intermediate to low

• Low