Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

Surfactants work by ________.

Accepted Answer

A)   coating the organism, preventing interaction with its environment
B)   blocking transport into the organism
C)   blocking transport out from the organism
D)   disrupting membrane integrity
E)   All of the choices are correctF) All of the above
G) A) and B)

Question 3

Pseudomonas is resistant to soaps.

Accepted Answer

A) True 
 B)False

Question 4

A microorganism that is not motile and has stopped metabolizing could be considered dead.

Accepted Answer

A) True 
 B)False

Question 5

Hydrogen peroxide can be ________.

Accepted Answer

A)   sporicidal
B)   fungicidal
C)   bactericidal
D)   virucidal
E)   All of the choices are correctF) A) and D)
G) A) and C)

Question 6

Which of the following acids is not used to destroy or inhibit microbial cells in food?

Accepted Answer

A)   Acetic acid
B)   Benzoic acid
C)   Lactic acid
D)   Phosphoric acid
E)   Propionic acidF) C) and E)
G) A) and C)

Question 7

Aldehyde-based compounds, while effective sterilants, can be unstable and costly to use.

Accepted Answer

A) True 
 B)False

Question 8

Analine dyes, like crystal violet, have antimicrobial activity particularly against gram-positive bacteria and some fungi.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following scenarios are most appropriate for handwashing with an alcohol-based hand cleanser instead of soap and water?

Accepted Answer

A)   Following a diaper change with visible soiling on the hands after glove removal
B)   Following a wound dressing change when a glove tore during the procedure
C)   Prior to applying gloves
D)   Prior to returning to work after eating lunchE) A) and D)
F) B) and C)

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

The shortest time required to kill all the microbes in a sample at a specified temperature is called the ________.

Accepted Answer

A)   thermal death point (TDP) 
B)   thermal death time (TDT) 
C)   sporicidal time
D)   death phase point
E)   None of the choices are correctF) D) and E)
G) A) and E)

Question 12

Microbicidal agents are sterilants.

Accepted Answer

A) True 
 B)False

Question 13

The process of using a cleansing technique to mechanically remove and reduce microorganisms and debris to safe levels is ________.

Accepted Answer

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

Question 14

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 correctF) A) and E)
G) A) and C)

Question 15

Soaps and detergents are very effective as sterilants.

Accepted Answer

A) True 
 B)False

Question 16

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

Question 17

Which of the following is not a factor that affects germicidal activity?

Accepted Answer

A)   The material being treated
B)   The length of exposure
C)   The strength of the germicide
D)   The microorganism being treated
E)   All of these choices are factors.F) None of the above
G) A) and B)

Question 18

The easiest microbial forms to kill or inhibit are ________.

Accepted Answer

A)   prions
B)   vegetative bacteria and fungi
C)   endospores
D)   protozoan cysts
E)   mycobacteria and staphylococciF) B) and D)
G) A) and E)

Question 19

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) B) and E)

Question 20

A cleansing method that mechanically removes microbes and other debris to reduce contamination is ________.

Accepted Answer

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

Exam 9: Physical and Chemical Control of Microbes

Soaps and detergents are very effective as sterilants.

Correct AnswerverifiedShow Answer

Microbicidal agents are sterilants.

Correct AnswerverifiedShow Answer

Which is correct regarding the rate of microbial death?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is not a factor that affects germicidal activity?

Correct AnswerverifiedShow Answer

The shortest time required to kill all the microbes in a sample at a specified temperature is called the ________.

Correct AnswerverifiedShow Answer

HEPA filters are used to remove microbes from ________.

Correct AnswerverifiedShow Answer

Hydrogen peroxide can be ________.

Correct AnswerverifiedShow Answer

A microorganism that is not motile and has stopped metabolizing could be considered dead.

Correct AnswerverifiedShow Answer

A cleansing method that mechanically removes microbes and other debris to reduce contamination is ________.

Correct AnswerverifiedShow Answer

Which of the following acids is not used to destroy or inhibit microbial cells in food?

Correct AnswerverifiedShow Answer

Which of the following scenarios are most appropriate for handwashing with an alcohol-based hand cleanser instead of soap and water?

Correct AnswerverifiedShow Answer

Aldehyde-based compounds, while effective sterilants, can be unstable and costly to use.

Correct AnswerverifiedShow Answer

Pseudomonas is resistant to soaps.

Correct AnswerverifiedShow Answer

Which of the following does not affect microbial nucleic acids?

Correct AnswerverifiedShow Answer

Surfactants work by ________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The easiest microbial forms to kill or inhibit are ________.

Correct AnswerverifiedShow Answer

The process of using a cleansing technique to mechanically remove and reduce microorganisms and debris to safe levels is ________.

Correct AnswerverifiedShow Answer

Analine dyes, like crystal violet, have antimicrobial activity particularly against gram-positive bacteria and some fungi.

Correct AnswerverifiedShow Answer

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