Question 1

Dry heat

Accepted Answer

A)   is less efficient than moist heat.
B)   cannot sterilize.
C)   includes tyndallization.
D)   is used in devices called autoclaves.
E)   will sterilize at 121°C for 15 minutes.F) A) and D)
G) D) and E)

Question 2

Ionizing radiation is more effective than nonionizing radiation in killing or inactivating microbes.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following types of control agents would be used to achieve sterility?

Accepted Answer

A)   Virucide
B)   Bactericide
C)   Germicide
D)   Sporicide
E)   FungicideF) A) and D)
G) B) and C)

Question 4

Which of the following factors will influence the action of microbial agents?

Accepted Answer

A)   The number of microorganisms
B)   The type of microorganisms present
C)   Temperature and pH
D)   Mode and dosage of the agent
E)   All of the choices will influence the action.F) D) and E)
G) C) and E)

Question 5

_____ is a control method that removes microorganisms rather than inhibiting or killing them.

Accepted Answer

A)   Disinfection
B)   Filtration
C)   Boiling
D)   Radiation
E)   SterilizationF) A) and B)
G) A) and C)

Question 6

Intermittent sterilization,which uses 3 days of lower temperature steam for short periods of time,is also called ______.

Accepted Answer

A)   pasteurization
B)   incubation
C)   tyndallization
D)   disinfection
E)   desiccationF) B) and D)
G) C) and D)

Question 7

The use of chemical agents directly on exposed body surfaces to destroy or inhibit vegetative pathogens is ______.

Accepted Answer

A)   disinfection
B)   sterilization
C)   antisepsis
D)   sanitizationE) A) and B)
F) B) and C)

Question 8

Each of the following is a target of antimicrobial agents except ______.

Accepted Answer

A)   cell walls
B)   cell membranes
C)   ribosomes
D)   cellular proteins
E)   cytoplasmF) A) and D)
G) A) and B)

Question 9

The method of removing vegetative microbial life forms and debris to reduce contamination to safe levels is termed ______.

Accepted Answer

A)   antisepsis
B)   disinfection
C)   sterilization
D)   decontamination
E)   sanitizationF) A) and B)
G) A) and C)

Question 10

The presence of organic matter such as saliva and pus can interfere with the actions of disinfectants.

Accepted Answer

A) True 
 B)False

Question 11

Which of the following represents microbial control by osmotic pressure?

Accepted Answer

A)   Pickling cucumbers and other vegetables for long-term storage
B)   Placing fruit slices on a drying rack
C)   Canning tomatoes after a summer growing season to use throughout the winter
D)   The crew of the Mayflower using salted meats throughout their voyage to the New WorldE) A) and B)
F) B) and C)

Question 12

Chlorine and ethylene oxide are sterilizing gases.

Accepted Answer

A) True 
 B)False

Question 13

Hydrogen peroxide is used in the process of sterilizing instruments such as endoscopes.

Accepted Answer

A) True 
 B)False

Question 14

Prions require more extensive methods of sterilization than are needed for bacterial endospores.

Accepted Answer

A) True 
 B)False

Question 15

Alcohols

Accepted Answer

A)   denature proteins when in a 50-95% alcohol-water solution.
B)   disinfect items when soaking method is utilized.
C)   are skin degerming agents.
D)   at 50% or higher concentrations dissolve cell membrane lipids.
E)   All of the choices are correct.F) All of the above
G) A) and E)

Question 16

Pasteurization is used to sterilize milk.

Accepted Answer

A) True 
 B)False

Question 17

All of the following act as surfactants except ______.

Accepted Answer

A)   detergents
B)   quaternary ammonia
C)   iodine
D)   soaps
E)   alcoholsF) B) and C)
G) A) and E)

Question 18

Most microbial contaminants of food are killed or inactivated at freezing temperatures.

Accepted Answer

A) True 
 B)False

Question 19

Surgeons preparing for an invasive surgical procedure will scrub their hands thoroughly,and then they use a strong alcohol-based hand sanitizer which renders their hands sterile.

Accepted Answer

A) True 
 B)False

Question 20

Which of the following is a disadvantage of dry heat methods such as using a Bunsen burner to incinerate microbes from an inoculating loop and the use of a hot air oven?

Accepted Answer

A)   Bunsen burners and hot air ovens only reach a maximum of 100oC so they are not effective against endospores.
B)   Neither of these methods actually sterilize; they only kill vegetative cells.
C)   Bunsen burners take too long to sterilize and hot air ovens are hazardous for the operators.
D)   Use of an open flame can be dangerous and hot air ovens take much longer to sterilize than autoclaves.E) A) and B)
F) C) and D)

Exam 11: Physical and Chemical Control of Microbes

Ionizing radiation is more effective than nonionizing radiation in killing or inactivating microbes.

Correct AnswerverifiedShow Answer

Pasteurization is used to sterilize milk.

Correct AnswerverifiedShow Answer

Each of the following is a target of antimicrobial agents except ______.

Correct AnswerverifiedShow Answer

_____ is a control method that removes microorganisms rather than inhibiting or killing them.

Correct AnswerverifiedShow Answer

The use of chemical agents directly on exposed body surfaces to destroy or inhibit vegetative pathogens is ______.

Correct AnswerverifiedShow Answer

Intermittent sterilization,which uses 3 days of lower temperature steam for short periods of time,is also called ______.

Correct AnswerverifiedShow Answer

Which of the following factors will influence the action of microbial agents?

Correct AnswerverifiedShow Answer

Which of the following is a disadvantage of dry heat methods such as using a Bunsen burner to incinerate microbes from an inoculating loop and the use of a hot air oven?

Correct AnswerverifiedShow Answer

Prions require more extensive methods of sterilization than are needed for bacterial endospores.

Correct AnswerverifiedShow Answer

Hydrogen peroxide is used in the process of sterilizing instruments such as endoscopes.

Correct AnswerverifiedShow Answer

Chlorine and ethylene oxide are sterilizing gases.

Correct AnswerverifiedShow Answer

All of the following act as surfactants except ______.

Correct AnswerverifiedShow Answer

The presence of organic matter such as saliva and pus can interfere with the actions of disinfectants.

Correct AnswerverifiedShow Answer

The method of removing vegetative microbial life forms and debris to reduce contamination to safe levels is termed ______.

Correct AnswerverifiedShow Answer

Most microbial contaminants of food are killed or inactivated at freezing temperatures.

Correct AnswerverifiedShow Answer

Surgeons preparing for an invasive surgical procedure will scrub their hands thoroughly,and then they use a strong alcohol-based hand sanitizer which renders their hands sterile.

Correct AnswerverifiedShow Answer

Which of the following types of control agents would be used to achieve sterility?

Correct AnswerverifiedShow Answer

Alcohols

Correct AnswerverifiedShow Answer

Dry heat

Correct AnswerverifiedShow Answer

Which of the following represents microbial control by osmotic pressure?

Correct AnswerverifiedShow Answer

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