Question 1

All of the following pertain to hypochlorites, except

Accepted Answer

A)   they release hypochlorous acid in solution.
B)   they cause denaturation of enzymes.
C)   they are found in iodophors.
D)   they are used to disinfect dairy, restaurant, and medical equipment.
E)   they are found in common household bleach.F) A) and E)
G) A) and B)

Question 2

Ethylene oxide is

Accepted Answer

A)   sporicidal.
B)   only effective with high heat.
C)   the active agent in household bleach.
D)   used as an antiseptic against anaerobes.
E)   a halogen.F) All of the above
G) D) and E)

Question 3

Bacteriostatic agents kill bacterial cells.

Accepted Answer

A) True 
 B)False

Question 4

All of the following are methods of disinfection or sterilization, except

Accepted Answer

A)   gamma radiation.
B)   dry oven.
C)   lyophilization.
D)   triclosan.
E)   ethanol.F) A) and C)
G) C) and D)

Question 5

Commercial products containing which types of chemicals are more effective at killing microorganisms?

Accepted Answer

A)   bacteriostatic
B)   bacteriocidal
C)   carbohydrate
D)   leadE) A) and B)
F) All of the above

Question 6

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 C)
G) A) and B)

Question 7

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

Accepted Answer

A) True 
 B)False

Question 8

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) A) and D)
F) None of the above

Question 9

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

Question 10

The sterilizing gas used in a special chamber is

Accepted Answer

A)   ethylene oxide.
B)   iodophor.
C)   glutaraldehyde.
D)   formaldehyde.
E)   chlorine dioxide.F) A) and D)
G) A) and E)

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

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

Accepted Answer

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

Question 13

A method for sterilizing milk, called _____ temperature treatment, uses 134°C for 1 to 2 seconds.

Accepted Answer

The answer of A method for sterilizing milk, called _____...

Question 14

When a control agent targets the metabolic processes of microbial cells, active younger cells typically die more rapidly than older cells.

Accepted Answer

A) True 
 B)False

Question 15

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 D)
G) A) and B)

Question 16

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 E)
G) A) and B)

Question 17

_____ radiation excites atoms to a higher energy state within molecules such as DNA that then leads to the formation of pyrimidine dimers.

Accepted Answer

Nonionizin...

Question 18

Disinfection of beverages, such as apple juice, milk, and wine, is optimally achieved by

Accepted Answer

A)   pasteurization.
B)   chlorination.
C)   moist heat autoclave.
D)   filtration.
E)   boiling water.F) B) and E)
G) None of the above

Question 19

Which of these metals have antimicrobial properties associated with them?

Accepted Answer

A)   Silver
B)   Gold
C)   Tin
D)   Aluminum
E)   both silver and goldF) B) and D)
G) D) and E)

Question 20

Historically, which of the following was instilled into the eyes of newborn infants to prevent gonococcal infections?

Accepted Answer

A)   triclosan
B)   formaldehyde
C)   phenol
D)   silver nitrate
E)   mercurochromeF) C) and D)
G) B) and C)

Exam 11: Physical and Chemical Agents for Microbial Control

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

Correct AnswerverifiedShow Answer

A method for sterilizing milk, called _____ temperature treatment, uses 134°C for 1 to 2 seconds.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Ethylene oxide is

Correct AnswerverifiedShow Answer

The minimum sterilizing conditions in a steam autoclave are

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

The easiest microbial forms to kill or inhibit are

Correct AnswerverifiedShow Answer

All of the following pertain to hypochlorites, except

Correct AnswerverifiedShow Answer

_____ radiation excites atoms to a higher energy state within molecules such as DNA that then leads to the formation of pyrimidine dimers.

Correct AnswerverifiedNonionizin...View AnswerShow Answer

Historically, which of the following was instilled into the eyes of newborn infants to prevent gonococcal infections?

Correct AnswerverifiedShow Answer

Commercial products containing which types of chemicals are more effective at killing microorganisms?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of these metals have antimicrobial properties associated with them?

Correct AnswerverifiedShow Answer

When a control agent targets the metabolic processes of microbial cells, active younger cells typically die more rapidly than older cells.

Correct AnswerverifiedShow Answer

All of the following are methods of disinfection or sterilization, except

Correct AnswerverifiedShow Answer

Disinfection of beverages, such as apple juice, milk, and wine, is optimally achieved by

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Bacteriostatic agents kill bacterial cells.

Correct AnswerverifiedShow Answer

The sterilizing gas used in a special chamber is

Correct AnswerverifiedShow Answer

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Nonionizin...
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