Question 1

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)  degermation.F) B) and E)
G) All of the above

Question 2

The thermal death point of a strain of Stapylcococcus aureus was determined to be 63°C.How would the the thermal death point of Bacillus subtilis compare?

Accepted Answer

A)  The thermal death point of Bacillus subtilis would be just slightly higher than that of Staphylococcus aureus.
B)  The thermal death point of Bacillus subtilis would be significantly higher than that of Staphylococcus aureus.
C)  The thermal death point of Bacillus subtilis would be the same as that of Staphylococcus aureus.
D)  The thermal death point of Bacillus subtilis would be lower that of Staphylococcus aureus.E) All of the above
F) B) and C)

Question 3

__________ or steam sterilization is the process by which steam is heated under pressure to sterilize objects.

Accepted Answer

The answer of __________ or steam sterilization is the process...

Question 4

Which of the following chemicals is a disinfectant for soft contact lenses?

Accepted Answer

A)  hydrogen peroxide
B)  alcohol
C)  hexachlorophene
D)  glutaraldehyde
E)  hypochoritesF) B) and D)
G) B) and C)

Question 5

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) A) and C)
G) B) and E)

Question 6

Some microbial control agents are able to _____ cell proteins by breaking bonds that maintain the native state, three-dimensional configuration of the proteins.

Accepted Answer

denature; ...

Question 7

Chlorine compounds remain stable and effective in the presence of excess organic matter.

Accepted Answer

A) True 
 B)False

Question 8

Bacteriostatic agents kill bacterial cells.

Accepted Answer

A) True 
 B)False

Question 9

Which control method would not be a suitable choice for killing Mycobacteria in a capped culture tube?

Accepted Answer

A)  ultraviolet (germicidal)  light
B)  gamma rays
C)  121°C at 15 psi for 15 minutes
D)  160°C for 2 hours
E)  All of these choices are correct.F) A) and C)
G) B) and C)

Question 10

Iodophors include

Accepted Answer

A)  chloramines.
B)  povidone iodine.
C)  tincture of iodine.
D)  alcohols.
E)  chlorhexidine.F) A) and E)
G) A) and C)

Question 11

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.F) C) and D)
G) D) and E)

Question 12

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

Accepted Answer

A)  virucide
B)  bactericide
C)  germicide
D)  sporicide
E)  fungicideF) A) and B)
G) B) and D)

Question 13

Which is mismatched?

Accepted Answer

A)  sodium hypochlorite-chlorine
B)  iodophor-iodine
C)  benzalkoniumchloride-quaternary ammonium compound
D)  chlorhexidine-alcohol
E)  formalin-formaldehydeF) None of the above
G) C) and E)

Question 14

The easiest microbial forms to kill or inhibit are

Accepted Answer

A)  naked viruses.
B)  vegetative bacteria and fungi.
C)  endospores.
D)  protozoan cysts.
E)  Mycobacterium and Staphylococcus.F) C) and D)
G) B) and D)

Question 15

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) B) and C)
G) C) and D)

Question 16

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

Question 17

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 18

Alcohols

Accepted Answer

A)  denature proteins when in a 50-95% solution.
B)  are used to disinfect items by soaking.
C)  are skin degerming agents.
D)  at 50% or higher concentrations dissolve cell membrane lipids.
E)  All of these choices are correct.F) A) and E)
G) A) and D)

Question 19

Physical methods of microbial control will typically sterilize, whereas chemical methods will only disinfect.

Accepted Answer

A) True 
 B)False

Question 20

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.F) B) and C)
G) A) and E)

Exam 11: Physical and Chemical Agents for Microbial Control

The thermal death point of a strain of Stapylcococcus aureus was determined to be 63°C.How would the the thermal death point of Bacillus subtilis compare?

Correct AnswerverifiedShow Answer

Which is correct regarding the rate of microbial death?

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

Correct AnswerverifiedShow Answer

__________ or steam sterilization is the process by which steam is heated under pressure to sterilize objects.

Correct AnswerverifiedShow Answer

Which is mismatched?

Correct AnswerverifiedShow Answer

All of the following are correct about the autoclave, except

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Physical methods of microbial control will typically sterilize, whereas chemical methods will only disinfect.

Correct AnswerverifiedShow Answer

Which of the following chemicals is a disinfectant for soft contact lenses?

Correct AnswerverifiedShow Answer

Alcohols

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

Dry heat

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Bacteriostatic agents kill bacterial cells.

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Iodophors include

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Which control method would not be a suitable choice for killing Mycobacteria in a capped culture tube?

Correct AnswerverifiedShow Answer

Some microbial control agents are able to _____ cell proteins by breaking bonds that maintain the native state, three-dimensional configuration of the proteins.

Correct Answerverifieddenature; ...View AnswerShow Answer

The easiest microbial forms to kill or inhibit are

Correct AnswerverifiedShow Answer

The minimum sterilizing conditions in a steam autoclave are

Correct AnswerverifiedShow Answer

Chlorine compounds remain stable and effective in the presence of excess organic matter.

Correct AnswerverifiedShow Answer

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denature; ...
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