Question 1

When antiseptics and disinfectants are compared,antiseptics are generally

Accepted Answer

A)  less toxic.
B)  more toxic.
C)  equally as toxic.
D)  unpredictable in toxicity.E) A) and D)
F) All of the above

Question 2

The disinfecting properties of Lysol,a common household disinfectant,depend upon the presence of __________.

Accepted Answer

The answer of The disinfecting properties of Lysol,a common household...

Question 3

Because filtration removes rather than destroys microorganisms,it does not truly sterilize the materials passing through the filter.

Accepted Answer

A) True 
 B)False

Question 4

Amphipathic organic molecules that serve as disinfectants by disrupting membranes and denaturing proteins are called

Accepted Answer

A)  sterilants.
B)  oxidants.
C)  detergents.
D)  soaps.E) C) and D)
F) A) and C)

Question 5

Sterilization involves __________ all viable microorganisms.

Accepted Answer

A)  killing
B)  removing
C)  killing OR removing
D)  metabolically inactivatingE) All of the above
F) A) and D)

Question 6

Microorganisms show differential sensitivity to antimicrobial agents.

Accepted Answer

A) True 
 B)False

Question 7

Larger populations generally are killed as rapidly as smaller populations.

Accepted Answer

A) True 
 B)False

Question 8

Although heavy metals are no longer widely used as germicides,__________ is an effective algicide in lakes and swimming pools.

Accepted Answer

A)  lead acetate
B)  copper sulfate
C)  silver nitrate
D)  mercuric chlorideE) A) and B)
F) A) and C)

Question 9

Alcohols are widely used as antiseptics and disinfectants because they are effective against endospores as well as vegetative cells.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following represents the best definition for microbial death?

Accepted Answer

A)  The organism will not grow on minimal medium.
B)  The organism will not grow on a medium that normally supports its growth.
C)  The organism no longer retains its original shape and structures.
D)  None of these adequately describe microbial death.E) B) and D)
F) B) and C)

Question 11

The type of filter used in a laminar flow biological safety cabinet is called a(n)__________ filter.

Accepted Answer

HEPA (high...

Question 12

Pasteurization is used to

Accepted Answer

A)  Kill any pathogens present.
B)  Retard spoilage.
C)  Sterilize beverages.
D)  Kill any pathogens present and retard spoilage.E) A) and D)
F) None of the above

Question 13

When comparing dry heat and moist heat sterilization,dry heat is

Accepted Answer

A)  faster.
B)  slower.
C)  equally as fast.
D)  sometimes faster but sometimes slower.E) B) and C)
F) None of the above

Question 14

Heavy metals are effective antimicrobial agents but are not widely used because of their high toxicity to humans.

Accepted Answer

A) True 
 B)False

Question 15

Bacteriophage therapy was developed after antibiotics were first discovered and used for treating bacterial infections.

Accepted Answer

A) True 
 B)False

Question 16

Which of the following lacks sufficient penetrating power for bulk sterilization?

Accepted Answer

A)  Ultraviolet (UV) radiation at 260 nm.
B)  X rays.
C)  Gamma radiation.
D)  Alpha and beta particles.E) A) and D)
F) A) and C)

Question 17

Moist heat sterilization at 100 °\degree° C kills all of the following except

Accepted Answer

A)  bacterial endospores.
B)  fungal spores.
C)  viruses.
D)  bacterial endospores and fungal spores. E) All of the above
F) None of the above

Question 18

A(n) __________ is a chemical that can be used to sterilize materials.

Accepted Answer

A)  oxidant
B)  disinfectant
C)  antiseptic
D)  sterilantE) A) and B)
F) A) and D)

Question 19

Which of the following is not a method of heat sterilization?

Accepted Answer

A)  Autoclaving.
B)  Incineration.
C)  Pasteurization.
D)  Heating in a dry air oven.E) A) and B)
F) All of the above

Question 20

The disinfectant of choice for municipal water supplies is __________.

Accepted Answer

A)  fluorine
B)  chlorine
C)  either fluorine or chlorine
D)  ultraviolet lightE) None of the above
F) A) and C)

Exam 8: Control of Microorganisms in the Environment

Because filtration removes rather than destroys microorganisms,it does not truly sterilize the materials passing through the filter.

Correct AnswerverifiedShow Answer

Moist heat sterilization at 100 °\degree° C kills all of the following except

Correct AnswerverifiedShow Answer

A(n) __________ is a chemical that can be used to sterilize materials.

Correct AnswerverifiedShow Answer

When comparing dry heat and moist heat sterilization,dry heat is

Correct AnswerverifiedShow Answer

Heavy metals are effective antimicrobial agents but are not widely used because of their high toxicity to humans.

Correct AnswerverifiedShow Answer

Microorganisms show differential sensitivity to antimicrobial agents.

Correct AnswerverifiedShow Answer

Amphipathic organic molecules that serve as disinfectants by disrupting membranes and denaturing proteins are called

Correct AnswerverifiedShow Answer

Larger populations generally are killed as rapidly as smaller populations.

Correct AnswerverifiedShow Answer

When antiseptics and disinfectants are compared,antiseptics are generally

Correct AnswerverifiedShow Answer

The type of filter used in a laminar flow biological safety cabinet is called a(n)__________ filter.

Correct AnswerverifiedHEPA (high...View AnswerShow Answer

Which of the following is not a method of heat sterilization?

Correct AnswerverifiedShow Answer

Which of the following represents the best definition for microbial death?

Correct AnswerverifiedShow Answer

The disinfecting properties of Lysol,a common household disinfectant,depend upon the presence of __________.

Correct AnswerverifiedShow Answer

Which of the following lacks sufficient penetrating power for bulk sterilization?

Correct AnswerverifiedShow Answer

Alcohols are widely used as antiseptics and disinfectants because they are effective against endospores as well as vegetative cells.

Correct AnswerverifiedShow Answer

Bacteriophage therapy was developed after antibiotics were first discovered and used for treating bacterial infections.

Correct AnswerverifiedShow Answer

Pasteurization is used to

Correct AnswerverifiedShow Answer

Although heavy metals are no longer widely used as germicides,__________ is an effective algicide in lakes and swimming pools.

Correct AnswerverifiedShow Answer

The disinfectant of choice for municipal water supplies is __________.

Correct AnswerverifiedShow Answer

Sterilization involves __________ all viable microorganisms.

Correct AnswerverifiedShow Answer

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Moist heat sterilization at 100 $\degree$ C kills all of the following except

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HEPA (high...
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