Question 1

The sterilizing gas used in chemiclaves is ______.

Accepted Answer

A)   chlorine dioxide
B)   iodophor
C)   glutaraldehyde
D)   ethylene oxide
E)   formaldehydeF) B) and D)
G) All of the above

Question 2

Which of the following represents the use of osmotic pressure as a microbial control method?

Accepted Answer

A)   Exposing dental equipment to UV light
B)   Bleaching a kitchen counter
C)   Salting of meat
D)   Rinsing of a cut with BetadineE) A) and C)
F) C) and D)

Question 3

The chemical agent/s that produce/s highly reactive hydroxyl-free radicals and also decomposes to O2 gas is ______.

Accepted Answer

A)   hydrogen peroxide
B)   chlorhexidine
C)   iodophors
D)   cationic detergents
E)   CidexF) A) and B)
G) A) and C)

Question 4

Microbial death occurs when there is

Accepted Answer

A)   no movement.
B)   no reproduction.
C)   a change in appearance.
D)   a decrease in size.
E)   All of the choices occur.F) B) and E)
G) D) and E)

Question 5

Which antimicrobial method does not sterilize?

Accepted Answer

A)   Ionizing radiation
B)   Ethylene oxide gas
C)   Autoclave
D)   PasteurizationE) All of the above
F) None of the above D

Question 6

Organisms in the genus Pseudomonas are resistant to quats.

Accepted Answer

A) True 
 B)False

Question 7

Using a HEPA filter in a vacuum or furnace is an example of which microbial control method?

Accepted Answer

A)   Surfactant
B)   Gases
C)   Chemical agent
D)   Dry controlE) None of the above
F) B) and D)

Question 8

When considering time and temperature as factors in microbicidal activity,

Accepted Answer

A)   they are directly proportional to each other.
B)   they are inversely proportional to each other.
C)   they must be of equal value e.g. 30 minutes at 30oC.
D)   time is not a factor, only temperature.E) B) and D)
F) None of the above

Question 9

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

Accepted Answer

A)   Cured meats
B)   Human tissues such as heart valves and skin
C)   Operating room air
D)   Surgical gloves
E)   All of the choices are correct.F) A) and C)
G) A) and B)

Question 10

The alcohol wipe used on a patient's skin before an injection is an example of ______.

Accepted Answer

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

Question 11

Alcohols are more effective at inactivating enveloped viruses than naked viruses.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following does not affect microbial nucleic acids?

Accepted Answer

A)   Moist heat
B)   Ultraviolet light
C)   X rays
D)   Ethylene dioxide
E)   FormaldehydeF) A) and E)
G) C) and D)

Question 13

Which of the following is not a primary target of milk pasteurization?

Accepted Answer

A)   Salmonella
B)   Campylobacter jejuni
C)   Lactobacillus
D)   Listeria monocytogenes
E)   BrucellaF) A) and B)
G) A) and E)

Question 14

The minimum sterilizing conditions in a steam autoclave are

Accepted Answer

A)   121°C at 15 psi for 15 minutes.
B)   63°C for 30 minutes.
C)   100°C for 30 minutes.
D)   160°C for 2 hours.
E)   71.6°C for 15 seconds.F) C) and D)
G) A) and D)

Question 15

_____ radiation excites atoms to a higher energy state within molecules such as DNA,which leads to the formation of pyrimidine dimers.

Accepted Answer

A)   Ultraviolet
B)   Ionizing
C)   Infrared
D)   Gamma
E)   ParticleF) B) and D)
G) B) and C)

Question 16

You have inherited some old glass baby milk bottles from your grandmother,and you would like to use them instead of plastic bottles.The bottles are placed into a large metal container and placed in the oven at 325oF for about 2 hours.What factor would you change if you wanted the sterilization to occur much quicker?

Accepted Answer

A)   Place the bottles outside in the sunlight and then place in the oven
B)   Use a pressure cooker to sterilize the bottles with steam
C)   Pour an antimicrobial chemical into the bottles before placing into the oven
D)   Increase the temperature of the oven by 5 degreesE) A) and B)
F) A) and D)

Question 17

Which of the following is not true of chloramines?

Accepted Answer

A)   They contain chlorine.
B)   They are used to treat wounds and skin surfaces.
C)   They are safer than free chlorine.
D)   They can sanitize and disinfect.
E)   They form trihalomethanes with organic compounds.F) All of the above
G) C) and E)

Question 18

Ozone is a very effective disinfectant.

Accepted Answer

A) True 
 B)False

Question 19

Sterilization is achieved by

Accepted Answer

A)   flash pasteurization.
B)   hot water.
C)   boiling water.
D)   steam autoclave.
E)   All of the choices are correct.F) B) and D)
G) B) and E) D

Question 20

Which is correct regarding the rate of microbial death?

Accepted Answer

A)   Cells die at increasingly greater rates.
B)   Only older cells die in a culture.
C)   Cells in a culture die at a constant rate.
D)   Upon contact with the control agent, all cells die at one time.
E)   Cells become metabolically inactive but are never killed.F) D) and E)
G) A) and D) C

Exam 11: Physical and Chemical Control of Microbes

The sterilizing gas used in chemiclaves is ______.

Correct Answer
verified

Which of the following represents the use of osmotic pressure as a microbial control method?

Correct Answer
verified

The chemical agent/s that produce/s highly reactive hydroxyl-free radicals and also decomposes to O₂ gas is ______.

Correct Answer
verified

Microbial death occurs when there is

Correct Answer
verified

Which antimicrobial method does not sterilize?

Correct Answer
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D

Organisms in the genus Pseudomonas are resistant to quats.

Correct Answer
verified

Using a HEPA filter in a vacuum or furnace is an example of which microbial control method?

Correct Answer
verified

When considering time and temperature as factors in microbicidal activity,

Correct Answer
verified

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

Correct Answer
verified

The alcohol wipe used on a patient's skin before an injection is an example of ______.

Correct Answer
verified

Alcohols are more effective at inactivating enveloped viruses than naked viruses.

Correct Answer
verified

Which of the following does not affect microbial nucleic acids?

Correct Answer
verified

Which of the following is not a primary target of milk pasteurization?

Correct Answer
verified

The minimum sterilizing conditions in a steam autoclave are

Correct Answer
verified

_____ radiation excites atoms to a higher energy state within molecules such as DNA,which leads to the formation of pyrimidine dimers.

Correct Answer
verified

Correct Answer
verified

Which of the following is not true of chloramines?

Correct Answer
verified

Ozone is a very effective disinfectant.

Correct Answer
verified

Sterilization is achieved by

Correct Answer
verified
D

Which is correct regarding the rate of microbial death?

Correct Answer
verified
C

Exam 11: Physical and Chemical Control of Microbes

The sterilizing gas used in chemiclaves is ______.

Correct AnswerverifiedShow Answer

Which of the following represents the use of osmotic pressure as a microbial control method?

Correct AnswerverifiedShow Answer

The chemical agent/s that produce/s highly reactive hydroxyl-free radicals and also decomposes to O2 gas is ______.

Correct AnswerverifiedShow Answer

Microbial death occurs when there is

Correct AnswerverifiedShow Answer

Which antimicrobial method does not sterilize?

Correct AnswerverifiedD

Organisms in the genus Pseudomonas are resistant to quats.

Correct AnswerverifiedShow Answer

Using a HEPA filter in a vacuum or furnace is an example of which microbial control method?

Correct AnswerverifiedShow Answer

When considering time and temperature as factors in microbicidal activity,

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The alcohol wipe used on a patient's skin before an injection is an example of ______.

Correct AnswerverifiedShow Answer

Alcohols are more effective at inactivating enveloped viruses than naked viruses.

Correct AnswerverifiedShow Answer

Which of the following does not affect microbial nucleic acids?

Correct AnswerverifiedShow Answer

Which of the following is not a primary target of milk pasteurization?

Correct AnswerverifiedShow Answer

The minimum sterilizing conditions in a steam autoclave are

Correct AnswerverifiedShow Answer

_____ radiation excites atoms to a higher energy state within molecules such as DNA,which leads to the formation of pyrimidine dimers.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following is not true of chloramines?

Correct AnswerverifiedShow Answer

Ozone is a very effective disinfectant.

Correct AnswerverifiedShow Answer

Sterilization is achieved by

Correct AnswerverifiedD

Which is correct regarding the rate of microbial death?

Correct AnswerverifiedC

Correct Answer
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Correct Answer
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The chemical agent/s that produce/s highly reactive hydroxyl-free radicals and also decomposes to O₂ gas is ______.

Correct Answer
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Correct Answer
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Correct Answer
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D

Correct Answer
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D

Correct Answer
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C