Question 1

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)   Cidex
E)   cationic detergentsF) All of the above
G) C) and D)

Question 2

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

Accepted Answer

A)   desiccation
B)   ultraviolet light
C)   ethyl alcohol
D)   hydrogen peroxide
E)   gamma rays and X raysF) B) and D)
G) A) and D)

Question 3

Physical agents for controlling microbial growth include all of the following except ______.

Accepted Answer

A)   ultraviolet radiation
B)   boiling water
C)   pasteurization
D)   hydrogen peroxideE) B) and D)
F) C) and D)

Question 4

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

Question 5

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

Accepted Answer

A)   bind
B)   mutate
C)   denature
D)   dissolveE) B) and C)
F) All of the above

Question 6

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 pointE) A) and B)
F) A) and C)

Question 7

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

Accepted Answer

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

Question 8

Ionizing radiation is more effective than nonionizing radiation in killing or inactivating microbes.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following germicides is/are also sporicidal?

Accepted Answer

A)   Betadine
B)   Chlorine
C)   Phenolics
D)   Chlorhexidine
E)   All of the choices except phenolics.F) A) and E)
G) B) and E)

Question 10

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 C)
G) B) and D)

Question 11

In lab, inoculating loops are sterilized using ______.

Accepted Answer

A)   gas sterilization
B)   ﬁltration
C)   moist heat
D)   chemicals
E)   incinerationF) A) and B)
G) A) and C)

Question 12

Dry heat _______.

Accepted Answer

A)   is less e?cient than moist heat
B)   cannot sterilize
C)   includes tyndallization
D)   is used in devices called autoclaves
E)   will sterilize at 121°C for 15 minutesF) D) and E)
G) C) and D)

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

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

Accepted Answer

A)   desiccation
B)   ﬂash freeze
C)   lyophilization
D)   pasteurization
E)   sterilizationF) B) and C)
G) B) and E)

Question 15

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) A) and E)
G) All of the above

Question 16

All of the following are phenols or phenolics except ______.

Accepted Answer

A)   hexachlorophene
B)   Lysol
C)   cresols
D)   triclosan
E)   ZephiranF) A) and B)
G) C) and D)

Question 17

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

Question 18

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) C) and D)
G) D) and E)

Question 19

Prions require more extensive methods of sterilization than are needed for bacterial endospores.

Accepted Answer

A) True 
 B)False

Question 20

Ethylene oxide is ______.

Accepted Answer

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

Exam 11: Physical and Chemical Control of Microbes

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

Correct AnswerverifiedShow Answer

Ionizing radiation is more effective than nonionizing radiation in killing or inactivating microbes.

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

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Sterilization is achieved by _______.

Correct AnswerverifiedShow Answer

Physical agents for controlling microbial growth include all of the following except ______.

Correct AnswerverifiedShow Answer

Dry heat _______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In lab, inoculating loops are sterilized using ______.

Correct AnswerverifiedShow Answer

All of the following are phenols or phenolics except ______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Microbial death occurs when there is _______.

Correct AnswerverifiedShow Answer

Which of the following germicides is/are also sporicidal?

Correct AnswerverifiedShow Answer

HEPA ﬁlters are used to remove microbes from _______.

Correct AnswerverifiedShow Answer

Prions require more extensive methods of sterilization than are needed for bacterial endospores.

Correct AnswerverifiedShow Answer

Ethylene oxide is ______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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