Question 1

Vials of microorganisms that undergo the freeze-drying process called _____ will remain preserved and viable for years.

Accepted Answer

The answer of Vials of microorganisms that undergo the freeze-drying...

Question 2

Sterilization is achieved by

Accepted Answer

A)   flash pasteurization.
B)   hot water.
C)   boiling water.
D)   steam autoclave.
E)   All of these choices are correct.

Question 3

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

Accepted Answer

A)   disinfection.
B)   sterilization.
C)   antisepsis.
D)   sanitization.
E)   degermation.

Question 4

Which of the following is being used to replace hypochlorites in treating water because of the possibility of cancer-causing substances being produced?

Accepted Answer

A)   hydrogen peroxide
B)   chloramines
C)   fluorine
D)   quaternary ammonium compounds
E)   sodium iodide

Question 5

All of the following are major categories of microbial control methods except

Accepted Answer

A)   physical agents.
B)   chemical agents.
C)   mechanical removal methods.
D)   genetic methods.

Question 6

Endospores can be killed by

Accepted Answer

A)   dry heat at 170°C for 2 hours.
B)   incineration.
C)   glutaldehyde for 8 or more hours.
D)   ethylene oxide for 3 or more hours.
E)   All of these choices are correct.

Question 7

Isopropyl alcohol wiped across a skin site can sterilize it.

Accepted Answer

A) True 
 B)False

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

Most microbial contaminants of food are killed at freezing temperatures.

Accepted Answer

A) True 
 B)False

Question 10

Chlorine dioxide and ethylene oxide are gaseous sterilants.

Accepted Answer

A) True 
 B)False

Question 11

Electrons are ejected from atoms in cells when organisms are exposed to

Accepted Answer

A)   dessication.
B)   ultraviolet light.
C)   ethyl alcohol.
D)   hydrogen peroxide.
E)   gamma rays and X-rays.

Question 12

The thermal death time for

Accepted Answer

A)   The thermal death time will be longer.
B)   The thermal death time will be shorter.
C)   There will be no change in thermal death time.
D)   There is not enough information to make this prediction.
E)   coli at 63°C was determined to be 20 minutes. Predict the affect on thermal death time if the temperature is increased to 67°C.

Question 13

Which of the following does not contain a heavy metal?

Accepted Answer

A)   tincture of iodine
B)   merthiolate
C)   silver nitrate solutions
D)   zinc
E)   mercurochrome

Question 14

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

Accepted Answer

A) True 
 B)False

Question 15

Filtration is an effective method to remove microbes from air and liquids.

Accepted Answer

A) True 
 B)False

Question 16

All of the following are correct about iodophors, except

Accepted Answer

A)   they are complexes of iodine and a neutral polymer.
B)   this formulation allows a quick release of free iodine.
C)   this formulation increases its penetration.
D)   it is less prone to staining or irritating tissue.
E)   a common iodophor is Betadine.

Question 17

All of the following are correct about the autoclave, except

Accepted Answer

A)   it is important not to overload the chamber.
B)   it is effective for sterilizing powders, oils, and waxy substances.
C)   the duration of the process depends on how full the chamber is.
D)   it is the temperature that kills the microbes, not the pressure by itself.
E)   sterilization is achieved when steam condenses against the objects in the chamber and raises their temperatures.

Question 18

Which of the following items are typically irradiated in order to kill microbes?

Accepted Answer

A)   ground beef and other meat and poultry
B)   human tissues such as heart valves and skin
C)   operating room air
D)   surgical gloves
E)   All of these choices are correct.

Question 19

HEPA filters are used to remove microbes from

Accepted Answer

A)   air.
B)   liquids.
C)   human tissues.
D)   medical instruments.
E)   All of these choices are correct.

Question 20

Discuss the advantages and disadvantages of irradiating food. Include examples of foods that are irradiated.

Accepted Answer

Irradiating food has several advantages,...

Exam 11: Physical and Chemical Agents for Microbial Control

Electrons are ejected from atoms in cells when organisms are exposed to

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The thermal death time for

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All of the following are correct about iodophors, except

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All of the following are correct about the autoclave, except

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Discuss the advantages and disadvantages of irradiating food. Include examples of foods that are irradiated.

Correct AnswerAnswered by ExamLex AIIrradiating food has several advantages,...View AnswerShow Answer

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

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Which of the following does not contain a heavy metal?

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Chlorine dioxide and ethylene oxide are gaseous sterilants.

Correct AnswerverifiedShow Answer

HEPA filters are used to remove microbes from

Correct AnswerverifiedShow Answer

Vials of microorganisms that undergo the freeze-drying process called _____ will remain preserved and viable for years.

Correct AnswerverifiedShow Answer

Most microbial contaminants of food are killed at freezing temperatures.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following items are typically irradiated in order to kill microbes?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is being used to replace hypochlorites in treating water because of the possibility of cancer-causing substances being produced?

Correct AnswerverifiedShow Answer

Isopropyl alcohol wiped across a skin site can sterilize it.

Correct AnswerverifiedShow Answer

Endospores can be killed by

Correct AnswerverifiedShow Answer

All of the following are major categories of microbial control methods except

Correct AnswerverifiedShow Answer

Filtration is an effective method to remove microbes from air and liquids.

Correct AnswerverifiedShow Answer

Sterilization is achieved by

Correct AnswerverifiedShow Answer

Correct Answer
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Answered by ExamLex AI
Irradiating food has several advantages,...
View Answer

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