Question 1

An agent used to reduce the number of bacteria on a toilet would most accurately be called a(n)

Accepted Answer

A)   disinfectant.
B)   aseptic.
C)   fungicide.
D)   antiseptic.
E)   virucide.F) B) and D)
G) A) and B)

Question 2

All of the following factors contribute to hospital-acquired infections EXCEPT

Accepted Answer

A)   some bacteria metabolize disinfectants.
B)   bacteria may be present in commercial products such as mouthwash.
C)   gram-negative bacteria are often resistant to disinfectants.
D)   invasive procedures can provide a portal of entry for bacteria.
E)   None of the answers is correct; all of these factors may contribute to hospital -acquired infection.F) C) and D)
G) B) and D)

Question 3

The pH of the medium has no effect on the activity of the disinfectant being applied.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following best describes the pattern of microbial death?

Accepted Answer

A)   The cells in a population die at a constant rate.
B)   Not all of the cells in a culture are killed.
C)   The pattern varies depending on the species.
D)   All the cells in a culture die at once.
E)   The pattern varies depending on the antimicrobial agent.F) C) and D)
G) B) and C)

Question 5

Application of heat to living cells can result in all of the following EXCEPT

Accepted Answer

A)   decreased thermal death time.
B)   alteration of membrane permeability.
C)   damage to nucleic acids.
D)   breaking of hydrogen bonds.
E)   denaturation of enzymes.F) A) and E)
G) C) and D)

Question 6

Bone and tendons for transplant are decontaminated by

Accepted Answer

A)   peroxygens.
B)   ethylene oxide.
C)   supercritical fluids.
D)   plasma sterilization.
E)   glutaraldehyde.F) A) and C)
G) B) and E) C

Question 7

All of the following are methods of food preservation EXCEPT

Accepted Answer

A)   ionizing radiation.
B)   high pressure.
C)   osmotic pressure.
D)   microwaves.
E)   desiccation.F) All of the above
G) B) and D)

Question 8

Which of the following chemical agents is used for sterilization?

Accepted Answer

A)   alcohol
B)   ethylene oxide
C)   phenolics
D)   chlorine
E)   soapF) C) and E)
G) All of the above B

Question 9

Which of the following regarding antimicrobial control agents is FALSE?

Accepted Answer

A)   Some agents kill by denaturing microbial cell proteins.
B)   Alcohols effectively inactivate nonenveloped viruses by attacking lipids.
C)   Contaminating organic debris such as blood or sputum decrease effectiveness.
D)   Silver is used for treating antibiotic-resistant bacteria.
E)   Some agents affect microbial cell membranes by dissolving lipids.F) A) and C)
G) A) and E)

Question 10

Figure 7.1
  A suspension of 106 Bacillus cereus endospores was put in a hot-air oven at 170°C. Plate counts were used to determine the number of endospores surviving at the time intervals shown.
-In Figure 7.1, the thermal death point for this culture is

Accepted Answer

A)   15 minutes.
B)   30 minutes.
C)   50°C.
D)   170°C.
E)   The answer cannot be determined based on the information providedF) B) and E)
G) A) and D)

Question 11

The antimicrobial activity of chlorine is due to which of the following?

Accepted Answer

A)   the formation of a hypochlorite ion
B)   the formation of ozone
C)   the formation of hypochlorous acid
D)   the formation of hydrochloric acid
E)   disruption of the plasma membraneF) None of the above
G) A) and B)

Question 12

Which of the following does NOT achieve sterilization?

Accepted Answer

A)   autoclave
B)   pasteurization
C)   supercritical fluids
D)   dry heat
E)   ethylene oxideF) A) and B)
G) A) and C)

Question 13

Any process that destroys the non-spore forming contaminants on inanimate objects is sterilization.

Accepted Answer

A) True 
 B)False  False

Question 14

Which of the following pairs is mismatched?

Accepted Answer

A)   organic acids - food preservation
B)   Ag - wound dressings
C)   alcohols - open wounds
D)   CuSO₂ - algicide
E)   H₂O₂ - open woundsF) None of the above
G) B) and D)

Question 15

Which of the following substances is used for surgical hand scrubs?

Accepted Answer

A)   phenol
B)   glutaraldehyde
C)   chlorine bleach
D)   soap
E)   chlorhexidineF) B) and E)
G) C) and D)

Question 16

Table 7.1
A disk-diffusion test using Staphylococcus gave the following results:
   Disinfectant  Zone of inhibition (mm)   A 0 B 2.5 C 10 D 5\begin{array} { c c } 	ext { Disinfectant } & 	ext { Zone of inhibition (mm)  } \\hline 	ext { A } & 0 \	ext { B } & 2.5 \	ext { C } & 10 \	ext { D } & 5\end{array} Disinfectant  A  B  C  D ​ Zone of inhibition (mm)  02.5105​​ 
-In Table 7.1, which compound was the most effective against E. coli?

Accepted Answer

A)   A
B)   B
C)   C
D)   D
E)   The answer cannot be determined based on the information provided. F) A) and B)
G) None of the above

Question 17

Which of the following methods is used to preserve food by slowing the metabolic processes of foodborne microbes?

Accepted Answer

A)   pasteurization
B)   lyophilization
C)   ionizing radiation
D)   nonionizing radiation
E)   freezingF) None of the above
G) A) and D)

Question 18

Which of the following pairs is mismatched?

Accepted Answer

A)   ionizing radiation - hydroxyl radicals
B)   ultraviolet radiation - desiccation
C)   supercritical fluids - CO₂
D)   plasma sterilization - free radicals
E)   ozone - takes electrons from substancesF) A) and D)
G) D) and E)

Question 19

The thermal death time is the time needed to kill all the bacteria in a particular culture at a certain temperature.

Accepted Answer

A) True 
 B)False

Question 20

Some antimicrobial chemicals are considered to be disinfectants and antiseptics.

Accepted Answer

A) True 
 B)False

Exam 7: The Control of Microbial Growth

An agent used to reduce the number of bacteria on a toilet would most accurately be called a(n)

Correct Answer
verified

All of the following factors contribute to hospital-acquired infections EXCEPT

Correct Answer
verified

The pH of the medium has no effect on the activity of the disinfectant being applied.

Correct Answer
verified

Which of the following best describes the pattern of microbial death?

Correct Answer
verified

Application of heat to living cells can result in all of the following EXCEPT

Correct Answer
verified

Bone and tendons for transplant are decontaminated by

Correct Answer
verified
C

All of the following are methods of food preservation EXCEPT

Correct Answer
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Which of the following chemical agents is used for sterilization?

Correct Answer
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B

Which of the following regarding antimicrobial control agents is FALSE?

Correct Answer
verified

Figure 7.1 A suspension of 106 Bacillus cereus endospores was put in a hot-air oven at 170°C. Plate counts were used to determine the number of endospores surviving at the time intervals shown. -In Figure 7.1, the thermal death point for this culture is

Correct Answer
verified

The antimicrobial activity of chlorine is due to which of the following?

Correct Answer
verified

Which of the following does NOT achieve sterilization?

Correct Answer
verified

Any process that destroys the non-spore forming contaminants on inanimate objects is sterilization.

Correct Answer
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False

Which of the following pairs is mismatched?

Correct Answer
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Which of the following substances is used for surgical hand scrubs?

Correct Answer
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Correct Answer
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Which of the following methods is used to preserve food by slowing the metabolic processes of foodborne microbes?

Correct Answer
verified

Which of the following pairs is mismatched?

Correct Answer
verified

The thermal death time is the time needed to kill all the bacteria in a particular culture at a certain temperature.

Correct Answer
verified

Some antimicrobial chemicals are considered to be disinfectants and antiseptics.

Correct Answer
verified

Exam 7: The Control of Microbial Growth

An agent used to reduce the number of bacteria on a toilet would most accurately be called a(n)

Correct AnswerverifiedShow Answer

All of the following factors contribute to hospital-acquired infections EXCEPT

Correct AnswerverifiedShow Answer

The pH of the medium has no effect on the activity of the disinfectant being applied.

Correct AnswerverifiedShow Answer

Which of the following best describes the pattern of microbial death?

Correct AnswerverifiedShow Answer

Application of heat to living cells can result in all of the following EXCEPT

Correct AnswerverifiedShow Answer

Bone and tendons for transplant are decontaminated by

Correct AnswerverifiedC

All of the following are methods of food preservation EXCEPT

Correct AnswerverifiedShow Answer

Which of the following chemical agents is used for sterilization?

Correct AnswerverifiedB

Which of the following regarding antimicrobial control agents is FALSE?

Correct AnswerverifiedShow Answer

Figure 7.1 A suspension of 106 Bacillus cereus endospores was put in a hot-air oven at 170°C. Plate counts were used to determine the number of endospores surviving at the time intervals shown. -In Figure 7.1, the thermal death point for this culture is

Correct AnswerverifiedShow Answer

The antimicrobial activity of chlorine is due to which of the following?

Correct AnswerverifiedShow Answer

Which of the following does NOT achieve sterilization?

Correct AnswerverifiedShow Answer

Any process that destroys the non-spore forming contaminants on inanimate objects is sterilization.

Correct AnswerverifiedFalse

Which of the following pairs is mismatched?

Correct AnswerverifiedShow Answer

Which of the following substances is used for surgical hand scrubs?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following methods is used to preserve food by slowing the metabolic processes of foodborne microbes?

Correct AnswerverifiedShow Answer

Which of the following pairs is mismatched?

Correct AnswerverifiedShow Answer

The thermal death time is the time needed to kill all the bacteria in a particular culture at a certain temperature.

Correct AnswerverifiedShow Answer

Some antimicrobial chemicals are considered to be disinfectants and antiseptics.

Correct AnswerverifiedShow Answer

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C

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B

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False

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