Microbial Control

The process of using a cleansing technique to mechanically remove and reduce microorganisms and debris to safe levels is

• sterilization

• degermation

• disinfection

• sanitization

The chemical agent(s) that produces highly reactive hydroxyl-free radicals and also decomposes to O₂ gas is/are

• chlorohexidine

• hydrogen peroxide

• iodophors

• cationic detergents

Commercial products containing which types of chemicals are more effective at killing microorganisms?

• lead

• bacteriostatic

• bacteriocidal

• carbohydrate

The minimum sterilizing conditions in a steam autoclave are

• 121 degrees C at psi for 15 minutes

• 71.6 degrees C for 15 seconds

• 100 degrees C for 30 minutes

• 160 degrees C for 2 hours

Which of these metals have antimicrobial properties associated with them?

• Tin

• Silver

• Gold

• Both silver and gold

Alcohols

• are used to disinfect items by soaking

• denature proteins when in a 50 - 95% solution

• at 50% or higher concentrations dissolve cell membrane lipids

• All of these are correct

Disinfection of beverages, such as apple juice, milk, and wine, is optimally achieved by

• filtration

• moist heat autoclave

• pasteurization

• boiling water

Historically, which of the following was instilled into the eyes of newborn infants to prevent gonococcal infections?

• silver nitrate

• formaldehyde

• phenol

• mercurochrome

Most microbial contaminants of food are killed at freezing temperatures.

• True

• False

All of the following are phenols or phenolics, except

• hexachlorophene

• chloramines

• lysol

• triclosan