Question 1

Oxidizing agents include all of the following EXCEPT

Accepted Answer

A) chlorine. 
B) glutaraldehyde. 
C) hydrogen peroxide. 
D) iodine. 
E) ozone. 
A) chlorine. 
B) glutaraldehyde. 
C) hydrogen peroxide. 
D) iodine. 
E) ozone.

Question 2

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 is the most effective at stopping bacterial growth?

Accepted Answer

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

Question 3

Table 7.1
A disk-diffusion test using Staphylococcus gave the following results:
 $$\begin{array} { c c } 
\text { Disinfectant } & \text { Zone of inhibition } ( \mathrm { mm } ) \
 \text { A } & 0 \
\text { B } & 2.5 \
\text { C } & 10 \
\text { D } & 5
\end{array}$$
-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. 
A) A 
B) B 
C) C 
D) D 
E) The answer cannot be determined based on the information provided.

Question 4

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

Accepted Answer

A) phenol 
B) chlorine bleach 
C) chlorhexidine 
D) soap 
E) glutaraldehyde 
A) phenol 
B) chlorine bleach 
C) chlorhexidine 
D) soap 
E) glutaraldehyde

Question 5

What are the advantages of gluteraldehyde compared to formaldehyde?

Accepted Answer

Glutaraldehyde and formaldehyde are both

Question 6

The most resistant of the bacterial endospores can withstand boiling for up to

Accepted Answer

A) 10 min. 
B) 30 min. 
C) 1 hour. 
D) 5 hours. 
E) 20 hours. 
A) 10 min. 
B) 30 min. 
C) 1 hour. 
D) 5 hours. 
E) 20 hours.

Question 7

Autoclaving is the most effective method of moist heat sterilization.

Accepted Answer

A) True 
 B)False

Question 8

How is hydrogen peroxide antimicrobial?

Accepted Answer

Hydrogen peroxide (H2O2) is a powerful o

Question 9

Which of the following pairs of terms is mismatched?

Accepted Answer

A) bacteriostatic - kills vegetative bacterial cells 
B) germicide - kills microbes 
C) virucide - inactivates viruses 
D) sterilant - destroys all living microorganisms 
E) fungicide - kills yeasts and molds 
A) bacteriostatic - kills vegetative bacterial cells 
B) germicide - kills microbes 
C) virucide - inactivates viruses 
D) sterilant - destroys all living microorganisms 
E) fungicide - kills yeasts and molds

Question 10

All of the following substances are used to preserve foods EXCEPT

Accepted Answer

A) biguanides. 
B) nisin. 
C) potassium sorbate. 
D) sodium nitrite. 
E) calcium propionate. 
A) biguanides. 
B) nisin. 
C) potassium sorbate. 
D) sodium nitrite. 
E) calcium propionate.

Question 11

Which of the following does NOT achieve sterilization?

Accepted Answer

A) dry heat 
B) pasteurization 
C) autoclave 
D) supercritical fluids 
E) ethylene oxide 
A) dry heat 
B) pasteurization 
C) autoclave 
D) supercritical fluids 
E) ethylene oxide

Question 12

Explain the set up and expected results of a use-dilution test for an endospore-producing Clostridium and a solution of chlorhexidine.

Accepted Answer

The set up for a use-dilution test for a

Question 13

Which of the following pairs is mismatched?

Accepted Answer

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

Question 14

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

Question 15

Which of the following is a limitation of the autoclave?

Accepted Answer

A) It requires an excessively long time to achieve sterilization. 
B) It cannot inactivate viruses. 
C) It cannot kill endospores. 
D) It cannot be used with heat-labile materials. 
E) It cannot be used with glassware. 
A) It requires an excessively long time to achieve sterilization. 
B) It cannot inactivate viruses. 
C) It cannot kill endospores. 
D) It cannot be used with heat-labile materials. 
E) It cannot be used with glassware.

Question 16

HEPA filters are effective because they are designed to remove all airborne particulates,including microorganisms down to

Accepted Answer

A) 0.01 micrometers. 
B) 0.3 micrometers. 
C) 1 micrometer. 
D) 10 micrometers. 
E) 10 nanometers. 
A) 0.01 micrometers. 
B) 0.3 micrometers. 
C) 1 micrometer. 
D) 10 micrometers. 
E) 10 nanometers.

Question 17

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,what is the thermal death time?

Accepted Answer

A) 150°C 
B) 60 minutes 
C) 120 minutes 
D) 100°C 
E) The answer cannot be determined based on the information provided. 
A) 150°C 
B) 60 minutes 
C) 120 minutes 
D) 100°C 
E) The answer cannot be determined based on the information provided.

Question 18

Pseudomonas has been found growing in quaternary ammonium compounds (quats).

Accepted Answer

A) True 
 B)False

Question 19

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

Accepted Answer

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

Question 20

The most effective form of chlorine is which of the following?

Accepted Answer

A) hypochlorous acid 
B) hydrochloric acid 
C) ozone 
D) hypochlorite ion 
E) chloromine 
A) hypochlorous acid 
B) hydrochloric acid 
C) ozone 
D) hypochlorite ion 
E) chloromine

Exam 7: The Control of Microbial Growth

Oxidizing agents include all of the following EXCEPT

Table 7.1 A disk-diffusion test using Staphylococcus gave the following results: Disinfectant Zone of inhibition () A 0 B 2.5 C 10 D 5 -In Table 7.1,which compound was the most effective against E.coli?

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

What are the advantages of gluteraldehyde compared to formaldehyde?

The most resistant of the bacterial endospores can withstand boiling for up to

Autoclaving is the most effective method of moist heat sterilization.

How is hydrogen peroxide antimicrobial?

Which of the following pairs of terms is mismatched?

All of the following substances are used to preserve foods EXCEPT

Which of the following does NOT achieve sterilization?

Explain the set up and expected results of a use-dilution test for an endospore-producing Clostridium and a solution of chlorhexidine.

Which of the following pairs is mismatched?

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

Which of the following is a limitation of the autoclave?

HEPA filters are effective because they are designed to remove all airborne particulates,including microorganisms down to

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,what is the thermal death time?

Pseudomonas has been found growing in quaternary ammonium compounds (quats).

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

The most effective form of chlorine is which of the following?

The Microbial World and You

Chemical Principles

Observing Microorganisms Through a Microscope

Functional Anatomy of Prokaryotic and Eukaryotic

Microbial Metabolism

Microbial Growth

Microbial Genetics

Biotechnology and Dna Technology

Classification of Microorganisms

The Prokaryotes: Domains Bacteria and Archaea

The Eukaryotes: Fungi, algae, protozoa, and Helminths

Viruses,viroids,and Prions

Principles of Disease and Epidemiology

Microbial Mechanisms of Pathogenicity

Innate Immunity: Nonspecific Defenses of the Host

Adaptive Immunity: Specific Defenses of the Host

Practical Applications of Immunology

Disorders Associated With the Immune System

Antimicrobial Drugs

Microbial Diseases of the Skin and Eyes

Microbial Diseases of the Nervous System

Microbial Diseases of the Cardiovascular and Lymphatic Systems

Microbial Diseases of the Respiratory System

Microbial Diseases of the Digestive System

Microbial Diseases of the Urinary and Reproductive Systems

Environmental Microbiology

Applied and Industrial Microbiology

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