Question 1

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

Accepted Answer

A)   ultraviolet radiation
B)   boiling water
C)   HEPA filters
D)   pasteurization
E)   hydrogen peroxideF) B) and E)
G) B) and D)

Question 2

Chlorhexidine kills microbes by ________.

Accepted Answer

A)   targeting cell membranes, cell walls and denaturing proteins
B)   disrupting cell surface tension
C)   inactivating enzymes by binding to the active site
D)   blocking DNA replication
E)   forming free radicals that create thymine dimers in the DNAF) None of the above
G) B) and E)

Question 3

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

Accepted Answer

A) True 
 B)False

Question 4

Which of the following statements is true when comparing moist heat methods of microbial control to dry heat control?

Accepted Answer

A)   Both moist heat and dry heat methods can achieve complete sterilization.
B)   Only moist heat (autoclaving)  can sterilize objects, dry heat is limited to disinfection.
C)   Dry heat is more efficient than moist heat, requiring less time to sterilize objects.
D)   Boiling is a more successful method of sterilizing instruments than using a dry heat oven.E) A) and B)
F) A) and C)

Question 5

Heavy metals work by ________.

Accepted Answer

A)   rupturing the cell membrane
B)   inactivating proteins
C)   binding to DNA
D)   dissolving the cell wall
E)   mutating DNAF) All of the above
G) B) and C)

Question 6

Pasteurization does not kill endospores or thermoduric microbes.

Accepted Answer

A) True 
 B)False

Question 7

In lab, inoculating loops are sterilized using ________.

Accepted Answer

A)   moist heat
B)   chemicals
C)   incineration
D)   filtration
E)   ethylene oxideF) A) and B)
G) All of the above

Question 8

________ heat is more rapidly effective and efficient compared to ________ heat.

Accepted Answer

A)   High; dry
B)   High; moist
C)   Dry; moist
D)   Moist; dry
E)   Moist; highF) A) and E)
G) B) and E)

Question 9

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

Accepted Answer

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

Question 10

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 minutesF) A) and D)
G) A) and E)

Question 11

Alcohols ________.

Accepted Answer

A)   dissolve membrane lipids at concentrations of greater than 50%
B)   can be used for disinfection or antisepsis
C)   are skin degerming agents
D)   are limited in effectiveness due to rapid evaporation
E)   All of the choices are correctF) A) and D)
G) A) and C)

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

The use of aldehydes as antimicrobial agents is limited due to ________.

Accepted Answer

A)   their instability when pH or temperature is increased
B)   their explosive nature
C)   they will disinfect, but not sterilize
D)   they are ineffective in the presence of organic matterE) C) and D)
F) A) and B)

Question 14

The use of a physical or chemical process to destroy vegetative pathogens is ________.

Accepted Answer

A)   disinfection
B)   sterilization
C)   antisepsis
D)   sanitization
E)   degermationF) None of the above
G) A) and C)

Question 15

Placing organisms at 4oC is ________.

Accepted Answer

A)   bactericidal
B)   bacteristatic
C)   decontamination
D)   sterilization
E)   None of the choices are correctF) B) and D)
G) C) and D)

Question 16

The use of chemical agents directly on exposed body surfaces to destroy or inhibit vegetative pathogens is ________.

Accepted Answer

A)   disinfection
B)   sterilization
C)   antisepsis
D)   sanitization
E)   ionizationF) A) and B)
G) A) and D)

Question 17

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

A)   denature
B)   bind
C)   dissolve
D)   activate
E)   All of the choices are correct.F) C) and D)
G) A) and D)

Question 18

The betadine swab before blood donation is an example of ________.

Accepted Answer

A)   antisepsis
B)   disinfection
C)   sterilization
D)   decontamination
E)   sanitationF) All of the above
G) A) and D)

Question 19

The compound that is an organic base containing chlorine and two phenolic rings, and is used increasingly for mucous membrane irrigation, obstetrical washes, hand scrubbing, and prepping surgical skin sites is ________.

Accepted Answer

A)   carbolic acid
B)   chlorhexidine
C)   triclosan.
D)   formalin
E)   quarternary ammonium compoundsF) A) and B)
G) A) and E)

Question 20

Sterilization is achieved by ________.

Accepted Answer

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

Exam 9: Physical and Chemical Control of Microbes

Heavy metals work by ________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The compound that is an organic base containing chlorine and two phenolic rings, and is used increasingly for mucous membrane irrigation, obstetrical washes, hand scrubbing, and prepping surgical skin sites is ________.

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 AnswerverifiedShow Answer

The betadine swab before blood donation is an example of ________.

Correct AnswerverifiedShow Answer

The use of aldehydes as antimicrobial agents is limited due to ________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following statements is true when comparing moist heat methods of microbial control to dry heat control?

Correct AnswerverifiedShow Answer

Chlorhexidine kills microbes by ________.

Correct AnswerverifiedShow Answer

The use of a physical or chemical process to destroy vegetative pathogens is ________.

Correct AnswerverifiedShow Answer

________ heat is more rapidly effective and efficient compared to ________ heat.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Sterilization is achieved by ________.

Correct AnswerverifiedShow Answer

Alcohols ________.

Correct AnswerverifiedShow Answer

Placing organisms at 4oC is ________.

Correct AnswerverifiedShow Answer

Pasteurization does not kill endospores or thermoduric microbes.

Correct AnswerverifiedShow Answer

The use of chemical agents directly on exposed body surfaces to destroy or inhibit vegetative pathogens is ________.

Correct AnswerverifiedShow Answer

In lab, inoculating loops are sterilized using ________.

Correct AnswerverifiedShow Answer

Dry heat ________.

Correct AnswerverifiedShow Answer

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heat is more rapidly effective and efficient compared to heat.

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Placing organisms at 4^oC is ________.

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