Question 1

Disinfectants that damage membranes include

Accepted Answer

A)   alcohol.
B)   phenolics.
C)   iodine.
D)   hydrogen peroxide.
E)   both alcohol and phenolics. E

Question 2

Ultraviolet light penetrates (more/less)effectively than gamma rays.

Accepted Answer

less

Question 3

Aseptic means

Accepted Answer

A)   sterile.
B)   free of all microbes.
C)   clean.
D)   sanitized.
E)   free of pathogens. E

Question 4

The amount of time needed to sterilize materials using moist heat is (more/less)than the time needed to sterilize using dry heat.

Accepted Answer

The answer of The amount of time needed to sterilize...

Question 5

The use of lysozyme during the preparation of cheeses and wines is effective in reducing the numbers of

Accepted Answer

A)   fungi.
B)   viruses.
C)   bacteria.
D)   prions.
E)   all microbes.

Question 6

Desiccation,a time-honored method of preserving food,is effective because the

Accepted Answer

A)   heat of the process kills microbes.
B)   freezing step of the process kills microbes.
C)   salt concentration is too low to support metabolic function.
D)   UV light used in the process of sun drying penetrates effectively.
E)   water content is too low to support metabolic function.

Question 7

The process of incineration is used for

Accepted Answer

A)   sterilization.
B)   degerming.
C)   disinfection.
D)   sanitization.
E)   both disinfection and sanitization.

Question 8

Protozoan cysts are resistant to many disinfection methods.

Accepted Answer

A) True 
 B)False

Question 9

Formalin (37% formaldehyde)is used for

Accepted Answer

A)   antisepsis.
B)   disinfection.
C)   sterilization.
D)   sanitization.
E)   both disinfection and sterilization.

Question 10

Which of the following is used for microbial control in fresh fruits and vegetables?

Accepted Answer

A)   X rays
B)   ultraviolet light
C)   electron beams
D)   microwaves
E)   gamma rays

Question 11

Which of the following is the most difficult to inactivate?

Accepted Answer

A)   enveloped viruses
B)   fungus spores
C)   bacterial endospores
D)   nonenveloped viruses
E)   protozoan cysts

Question 12

The (endospores/cysts/prions)are the infectious agents most resistant to antimicrobial agents or processes.

Accepted Answer

The answer of The (endospores/cysts/prions)are the infectious agents most resistant...

Question 13

Which of the following can be used to disinfect air?

Accepted Answer

A)   HEPA filters
B)   ethylene oxide
C)   ultraviolet light
D)   both HEPA filters and ultraviolet light
E)   both ethylene oxide and ultraviolet light

Question 14

Which of the following is NOT a desirable characteristic of an ideal antimicrobial agent?

Accepted Answer

A)   it is inexpensive.
B)   it is stable during storage.
C)   it is harmless to humans.
D)   it only arrests growth of vegetative cells.
E)   it acts quickly.

Question 15

Which of the following is bacteriostatic?

Accepted Answer

A)   heating in an oven at 171°C for an hour
B)   freezing below 0°C
C)   filtration
D)   autoclaving
E)   flash pasteurization

Question 16

Removal of microbes from the skin is antisepsis.

Accepted Answer

A) True 
 B)False

Question 17

Refrigeration is an effective germicidal method.

Accepted Answer

A) True 
 B)False

Question 18

Which of the following antimicrobial agents is the most toxic to humans?

Accepted Answer

A)   70% alcohol
B)   ethylene oxide
C)   quaternary ammonium compounds
D)   chloramines
E)   iodophors

Question 19

Slow freezing is more damaging to microbial cells than quick freezing.

Accepted Answer

A) True 
 B)False

Question 20

Elements such as iodine,chlorine,and bromine are examples of (oxidizers/halogens/metals),which are the basis for many effective antimicrobial agents.

Accepted Answer

The answer of Elements such as iodine,chlorine,and bromine are examples...

Exam 9: Controlling Microbial Growth in the Environment

Disinfectants that damage membranes include

Ultraviolet light penetrates (more/less)effectively than gamma rays.

Aseptic means

The amount of time needed to sterilize materials using moist heat is (more/less)than the time needed to sterilize using dry heat.

The use of lysozyme during the preparation of cheeses and wines is effective in reducing the numbers of

Desiccation,a time-honored method of preserving food,is effective because the

The process of incineration is used for

Protozoan cysts are resistant to many disinfection methods.

Formalin (37% formaldehyde) is used for

Which of the following is used for microbial control in fresh fruits and vegetables?

Which of the following is the most difficult to inactivate?

The (endospores/cysts/prions)are the infectious agents most resistant to antimicrobial agents or processes.

Which of the following can be used to disinfect air?

Which of the following is NOT a desirable characteristic of an ideal antimicrobial agent?

Which of the following is bacteriostatic?

Removal of microbes from the skin is antisepsis.

Refrigeration is an effective germicidal method.

Which of the following antimicrobial agents is the most toxic to humans?

Slow freezing is more damaging to microbial cells than quick freezing.

Elements such as iodine,chlorine,and bromine are examples of (oxidizers/halogens/metals),which are the basis for many effective antimicrobial agents.