Microbiology Ch 7 Controlling Microbial Growth

The absence of significant contamination on an object or in an area is referred to as

Heat-resistant bacteria that survive pasteurization are

Peracetic acid is a liquid chemical sporicide that is a type of

• peroxygen

• biguanide

• aldehyde

• halogen

Damage to which one of the following structures causes cellular contents to leak into the surrounding medium?

• Cell wall

• Plasma membrane

• Nucleoid

• Glycocalyx

The recommended optimum concentration of ethanol to use as a biocide is

• 100%

• 70%

• 50%

• 10%

Commercial sterilization is a limited heat treatment to destroy

• Streptococcus pyogenes

• Clostridium tetani

• Staphylococcus aureus

• Clostridium botulinum endospores

To sterilize heat-sensitive solutions such as culture media, enzymes, and vaccines, one should use

• dry heat

• an autoclave

• filtration

• pasteurization

Direct flaming is one of the simplest methods of

• pasteurization

• dry heat sterilization

• moist heat sterilization

• desiccation

Which treatment is intended to lower microbial counts on eating and drinking utensils to save public health levels?

• Sanitization

• Sterilization

• Pasteurization

• Antisepsis

One of the few liquid chemical disinfectants that can be considered a sterilizing agent and is also used for embalming is

• alcohol

• plasma

• glutaraldehyde

• iodine