Question 1

Aniline dyes like crystal violet have antimicrobial activity particularly against gram-positive bacteria and some fungi.

Accepted Answer

A) True 
 B)False

Question 2

A microorganism that is not motile and has stopped metabolizing is considered dead.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following acids is not used to destroy or inhibit microbial cells in food?

Accepted Answer

A)   Benzoic acid
B)   Acetic acid
C)   Lactic acid
D)   Phosphoric acid
E)   Propionic acidF) None of the above
G) B) and D)

Question 4

All of the following are alkylating control agents except ______.

Accepted Answer

A)   iodophor
B)   propylene oxide
C)   formaldehyde
D)   ethylene oxide
E)   glutaraldehydeF) None of the above
G) B) and C)

Question 5

The use of a physical or chemical process to destroy vegetative pathogens on inanimate objects is ______.

Accepted Answer

A)   disinfection
B)   sterilization
C)   antisepsis
D)   sanitization
E)   degermationF) A) and D)
G) B) and C)

Question 6

HEPA filters are used to remove microbes from

Accepted Answer

A)   air.
B)   liquids.
C)   human tissues.
D)   medical instruments.
E)   All of the choices are correct.F) C) and E)
G) A) and D)

Question 7

Which is mismatched?

Accepted Answer

A)   Iodophor - iodine
B)   Sodium hypochlorite - chlorine
C)   Merthiolate - silver
D)   Benzalkonium chloride - quaternary ammonium compound
E)   Formalin - formaldehydeF) None of the above
G) A) and C)

Question 8

_____ is a halogen used in gaseous and liquid form for large scale disinfection of drinking water and sewage.

Accepted Answer

A)   Iodine
B)   Chlorine
C)   Bromine
D)   Fluorine
E)   BetadineF) A) and D)
G) B) and E)

Question 9

Which of the following methods of microbial control is mismatched?

Accepted Answer

A)   Pickling eggs - osmotic pressure
B)   Exposure of surgical equipment to ultraviolet light - radiation
C)   Heating a liquid to 71.6oC for 15 seconds - pasteurization
D)   Autoclaving nutrient agar before pouring into Petri plates - sterilizationE) C) and D)
F) None of the above

Question 10

The method of removing vegetative life forms from living surfaces is termed ______.

Accepted Answer

A)   antisepsis
B)   disinfection
C)   sterilization
D)   decontaminationE) C) and D)
F) All of the above

Question 11

Agents that can denature microbial proteins include all of the following except ______.

Accepted Answer

A)   moist heat
B)   alcohol
C)   acids
D)   metallic ions
E)   X raysF) A) and B)
G) A) and C)

Question 12

Which of the following microbial forms has the highest resistance to physical and chemical controls?

Accepted Answer

A)   Naked viruses
B)   Protozoan cysts
C)   Fungal spores
D)   Bacterial endospores
E)   YeastF) B) and E)
G) C) and D)

Question 13

The difference between thermal death time and thermal death point in microbicidal activity is that

Accepted Answer

A)   thermal death time is the greatest amount of time required to kill an organism at a specific temperature, whereas thermal death temperature is the lowest temperature required to kill an organism in 10 minutes.
B)   thermal death time is the shortest amount of time required to kill an organism at a specific temperature, whereas thermal death temperature is the lowest temperature required to kill an organism in 30 minutes.
C)  thermal death time is the shortest amount of time required to kill an organism at a 100oC, whereas thermal death temperature is the lowest temperature required to kill an organism in 10 minutes.
D)   thermal death time is the shortest amount of time required to kill an organism at a specific temperature, whereas thermal death temperature is the lowest temperature required to kill an organism in 10 minutes.E) A) and D)
F) B) and D)

Question 14

A method for sterilizing milk,called _____ treatment,uses 134°C for 1 to 2 seconds.

Accepted Answer

A)   pasteurization
B)   batch pasteurization
C)   flash pasteurization
D)   ultra high temperature
E)   tyndallizationF) B) and E)
G) C) and D)

Question 15

The lowest temperature needed to kill or inactivate all microbes in 10 minutes is the

Accepted Answer

A)   thermal death point (TDP) .
B)   thermal death time (TDT) .
C)   sporicidal time.
D)   death phase point.E) None of the above
F) All of the above

Question 16

Which of the following forms of radiation are in order from the most penetrating to the least penetrating?

Accepted Answer

A)   Gamma, cathode, X rays
B)   Gamma, X rays, cathode
C)   Cathode, gamma, X ray
D)   X ray, gamma, cathode
E)   Cathode, X ray, gammaF) B) and E)
G) A) and B)

Question 17

The process that destroys or removes all microorganisms and microbial forms,including bacterial endospores,on inanimate objects is ______.

Accepted Answer

A)   disinfection
B)   sterilization
C)   antisepsis
D)   sanitization
E)   degermationF) A) and E)
G) A) and C)

Question 18

Ethylene oxide is

Accepted Answer

A)   only effective with high heat.
B)   a halogen.
C)   the active agent in household bleach.
D)   used as an antiseptic against anaerobes.
E)   sporicidal.F) A) and D)
G) B) and E)

Question 19

Pasteurization

Accepted Answer

A)   kills all vegetative forms.
B)   reduces the number of vegetative forms.
C)   reduces the number of endospores.
D)   increases food nutrient value.
E)   is used to sterilize food products.F) C) and D)
G) B) and C)

Question 20

Pasteurization does not inactivate endospores or thermoduric microbes.

Accepted Answer

A) True 
 B)False

Exam 11: Physical and Chemical Control of Microbes

Aniline dyes like crystal violet have antimicrobial activity particularly against gram-positive bacteria and some fungi.

Correct AnswerverifiedShow Answer

Which is mismatched?

Correct AnswerverifiedShow Answer

The method of removing vegetative life forms from living surfaces is termed ______.

Correct AnswerverifiedShow Answer

Which of the following methods of microbial control is mismatched?

Correct AnswerverifiedShow Answer

HEPA filters are used to remove microbes from

Correct AnswerverifiedShow Answer

Which of the following microbial forms has the highest resistance to physical and chemical controls?

Correct AnswerverifiedShow Answer

The lowest temperature needed to kill or inactivate all microbes in 10 minutes is the

Correct AnswerverifiedShow Answer

The process that destroys or removes all microorganisms and microbial forms,including bacterial endospores,on inanimate objects is ______.

Correct AnswerverifiedShow Answer

All of the following are alkylating control agents except ______.

Correct AnswerverifiedShow Answer

Agents that can denature microbial proteins include all of the following except ______.

Correct AnswerverifiedShow Answer

Pasteurization does not inactivate endospores or thermoduric microbes.

Correct AnswerverifiedShow Answer

The difference between thermal death time and thermal death point in microbicidal activity is that

Correct AnswerverifiedShow Answer

_____ is a halogen used in gaseous and liquid form for large scale disinfection of drinking water and sewage.

Correct AnswerverifiedShow Answer

A method for sterilizing milk,called _____ treatment,uses 134°C for 1 to 2 seconds.

Correct AnswerverifiedShow Answer

Which of the following forms of radiation are in order from the most penetrating to the least penetrating?

Correct AnswerverifiedShow Answer

Which of the following acids is not used to destroy or inhibit microbial cells in food?

Correct AnswerverifiedShow Answer

A microorganism that is not motile and has stopped metabolizing is considered dead.

Correct AnswerverifiedShow Answer

The use of a physical or chemical process to destroy vegetative pathogens on inanimate objects is ______.

Correct AnswerverifiedShow Answer

Pasteurization

Correct AnswerverifiedShow Answer

Ethylene oxide is

Correct AnswerverifiedShow Answer

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