Question 1

Which of the following regarding antimicrobial control agents is FALSE?

Accepted Answer

A)  Contaminating organic debris such as blood or sputum will decrease effectiveness.
B)  Some agents kill by denaturing microbial cell proteins.
C)  Some agents affect microbial cell membranes by dissolving lipids.
D)  Some agents are utilized as both an antiseptic and a disinfectant.
E)  Most chemical agents can achieve sterility.F) A) and B)
G) B) and C)

Question 2

Bone and tendons for transplant are decontaminated by

Accepted Answer

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

Question 3

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 } ( \mathrm { mm } )  \ 	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 Staphylococcus?

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  The answer cannot be determined based on the information provided. F) B) and D)
G) B) and C)

Question 4

Moist heat destroys organisms by denaturing proteins.

Accepted Answer

A) True 
 B)False

Question 5

Table 7.3
The following data were obtained by incubating gram-positive bacteria in nutrient medium + disinfectant for 24 hours,then transferring one loopful to nutrient medium (subculturing) .(+ = growth;- = no growth) 
 
-In Table 7.3,which disinfectant was most effective against Salmonella?

Accepted Answer

A)  Doom
B)  K.O.
C)  Mortum
D)  Sterl
E)  The answer cannot be determined based on the information provided.F) C) and D)
G) A) and D)

Question 6

If you were preparing nutrient agar at home and did not have an autoclave,what could you use to sterilize the nutrient agar?

Accepted Answer

A)  bleach
B)  boiling for one hour
C)  hydrogen peroxide
D)  oven at 121°C for one hour
E)  pressure cooker at 121°C for 15 minutesF) A) and B)
G) B) and C)

Question 7

An iodophor is a(n)

Accepted Answer

A)  phenol.
B)  agent that reduces oxygen.
C)  quaternary ammonium compound.
D)  form of formaldehyde.
E)  iodine mixed with a surfactant.F) A) and B)
G) C) and E)

Question 8

Which of the following regarding antimicrobial control agents is FALSE?

Accepted Answer

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

Question 9

Which chemical disinfectant can be considered a sterilizing liquid agent when appropriately applied?

Accepted Answer

A)  quaternary ammonium compounds
B)  70% ethanol
C)  sodium benzoate
D)  gluteraldehyde
E)  ethylene oxideF) A) and E)
G) B) and D)

Question 10

All of the following substances are effective against nonenveloped viruses EXCEPT

Accepted Answer

A)  alcohol.
B)  chlorine.
C)  ethylene oxide.
D)  ozone.
E)  None of the answers is correct;all of these are equally effective against nonenveloped viruses.F) All of the above
G) C) and D)

Question 11

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 decimal reduction time (D value) for the culture,which is defined as the time to reduce a population by one log,is approximately

Accepted Answer

A)  0 minutes.
B)  10 minutes.
C)  30 minutes.
D)  40 minutes.
E)  60 minutes.F) A) and E)
G) A) and B)

Question 12

Assume that you are responsible for decontaminating materials in a large hospital.How would you sterilize each of the following? Briefly justify your answers.
a.a mattress used by a patient with bubonic plague
b.intravenous glucose-saline solutions
c.used disposable syringes
d.tissues taken from patients

Accepted Answer

a. To sterilize a mattress used by a pa...

Question 13

Which of the following pairs is mismatched?

Accepted Answer

A)  Ag - wound dressings
B)  biguanide - sporocide
C)  CuSO₄ - algicide
D)  H₂O₂ - open wounds
E)  organic acids - food preservationF) A) and B)
G) C) and D)

Question 14

Which one of the following is known to be most resistant to quaternary ammonium compounds?

Accepted Answer

A)  gram positive bacteria
B)  members of the genus Pseudomonas
C)  members of the genus Staphylococcus
D)  fungi
E)  enveloped virusesF) B) and C)
G) A) and D)

Question 15

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 16

A kitchen countertop has a spill of vegetable oil that was wiped up but a film remains.What should be the next step in disinfecting this surface?

Accepted Answer

A)  10% bleach
B)  spray a disinfectant that contains a heavy metal
C)  warm soapy scrub
D)  isopropanol
E)  chlorhexidine containing solutionF) A) and B)
G) C) and E)

Question 17

Which of the following results in lethal damage to nucleic acids?

Accepted Answer

A)  heat
B)  radiation
C)  certain chemicals
D)  heat and radiation
E)  heat,radiation,and some chemicalsF) A) and B)
G) A) and C)

Question 18

Which of the following treatments is the most effective for controlling microbial growth?

Accepted Answer

A)  63°C for 30 minutes
B)  72°C for 15 seconds
C)  140°C for 4 seconds
D)  They are equivalent treatments.
E)  None of the answers is correct.F) A) and E)
G) A) and B)

Question 19

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

Accepted Answer

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

Question 20

Desiccation is a reliable form of sterilization.

Accepted Answer

A) True 
 B)False

Exam 7: The Control of Microbial Growth

A kitchen countertop has a spill of vegetable oil that was wiped up but a film remains.What should be the next step in disinfecting this surface?

Correct Answer
verified

Which one of the following is known to be most resistant to quaternary ammonium compounds?

Correct Answer
verified

Which chemical disinfectant can be considered a sterilizing liquid agent when appropriately applied?

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Desiccation is a reliable form of sterilization.

Correct Answer
verified

Which of the following treatments is the most effective for controlling microbial growth?

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
a. To sterilize a mattress used by a pa...
View Answer

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

Correct Answer
verified

An iodophor is a(n)

Correct Answer
verified

Which of the following regarding antimicrobial control agents is FALSE?

Correct Answer
verified

Which of the following results in lethal damage to nucleic acids?

Correct Answer
verified

Which of the following pairs is mismatched?

Correct Answer
verified

All of the following substances are effective against nonenveloped viruses EXCEPT

Correct Answer
verified

If you were preparing nutrient agar at home and did not have an autoclave,what could you use to sterilize the nutrient agar?

Correct Answer
verified

Bone and tendons for transplant are decontaminated by

Correct Answer
verified

Which of the following regarding antimicrobial control agents is FALSE?

Correct Answer
verified

Table 7.3 The following data were obtained by incubating gram-positive bacteria in nutrient medium + disinfectant for 24 hours,then transferring one loopful to nutrient medium (subculturing) .(+ = growth;- = no growth) -In Table 7.3,which disinfectant was most effective against Salmonella?

Correct Answer
verified

Correct Answer
verified

Moist heat destroys organisms by denaturing proteins.

Correct Answer
verified

Exam 7: The Control of Microbial Growth

A kitchen countertop has a spill of vegetable oil that was wiped up but a film remains.What should be the next step in disinfecting this surface?

Correct AnswerverifiedShow Answer

Which one of the following is known to be most resistant to quaternary ammonium compounds?

Correct AnswerverifiedShow Answer

Which chemical disinfectant can be considered a sterilizing liquid agent when appropriately applied?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Desiccation is a reliable form of sterilization.

Correct AnswerverifiedShow Answer

Which of the following treatments is the most effective for controlling microbial growth?

Correct AnswerverifiedShow Answer

Correct AnswerAnswered by ExamLex AI a. To sterilize a mattress used by a pa...View AnswerShow 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

An iodophor is a(n)

Correct AnswerverifiedShow Answer

Which of the following regarding antimicrobial control agents is FALSE?

Correct AnswerverifiedShow Answer

Which of the following results in lethal damage to nucleic acids?

Correct AnswerverifiedShow Answer

Which of the following pairs is mismatched?

Correct AnswerverifiedShow Answer

All of the following substances are effective against nonenveloped viruses EXCEPT

Correct AnswerverifiedShow Answer

If you were preparing nutrient agar at home and did not have an autoclave,what could you use to sterilize the nutrient agar?

Correct AnswerverifiedShow Answer

Bone and tendons for transplant are decontaminated by

Correct AnswerverifiedShow Answer

Which of the following regarding antimicrobial control agents is FALSE?

Correct AnswerverifiedShow Answer

Table 7.3 The following data were obtained by incubating gram-positive bacteria in nutrient medium + disinfectant for 24 hours,then transferring one loopful to nutrient medium (subculturing) .(+ = growth;- = no growth) -In Table 7.3,which disinfectant was most effective against Salmonella?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Moist heat destroys organisms by denaturing proteins.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
a. To sterilize a mattress used by a pa...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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