Question 1

Hydrogen peroxide is an effective

Accepted Answer

A)  sterilizing agent. 
B)  disinfectant. 
C)  antiseptic. 
D)  disinfecting and sterilizing agent. 
E)  antiseptic and disinfectant. 
A)  sterilizing agent. 
B)  disinfectant. 
C)  antiseptic. 
D)  disinfecting and sterilizing agent. 
E)  antiseptic and disinfectant.

Question 2

A student is shopping for antibacterial hand cleansers and is trying to decide which one to buy.One is a "waterless" hand gel containing 70% isopropanol,the second is an "antibacterial" hand soap containing triclosan (a phenolic),and the third is a wipe that lists benzethonium chloride (a synthetic quaternary ammonium salt)as the active ingredient.Compare and contrast these cleansers in terms of the action of the antimicrobial ingredient and the level of disinfection (degerming,germistatic,germicidal).

Accepted Answer

All three are germicidal,although not al

Question 3

Which of the following is used to sterilize items that should not,or cannot,be exposed to heat or water?

Accepted Answer

A)  ethylene oxide 
B)  formaldehyde 
C)  hydrogen peroxide 
D)  calcium hypochlorite 
E)  triclosan 
A)  ethylene oxide 
B)  formaldehyde 
C)  hydrogen peroxide 
D)  calcium hypochlorite 
E)  triclosan

Question 4

Which of the following is a sterilizing agent?

Accepted Answer

A)  ozone 
B)  hydrogen peroxide 
C)  peracetic acid 
D)  dish soap 
E)  ozone and hydrogen peroxide 
A)  ozone 
B)  hydrogen peroxide 
C)  peracetic acid 
D)  dish soap 
E)  ozone and hydrogen peroxide

Question 5

A scientist develops a new medication that is a protein compound and that must be administered by injection.Which of the following would be the most effective and safest means of preparing a sterile solution of the new medication?

Accepted Answer

A)  autoclaving 
B)  filtration 
C)  dilution with alcohol 
D)  lyophilization 
E)  ultraviolet irradiation 
A)  autoclaving 
B)  filtration 
C)  dilution with alcohol 
D)  lyophilization 
E)  ultraviolet irradiation

Question 6

Gamma irradiation is effective for sterilization because it

Accepted Answer

A)  damages molecules irreversibly. 
B)  is non-ionizing. 
C)  penetrates well. 
D)  destroys protein function, although DNA is undamaged. 
E)  is penetrating and causes extensive molecular damage. 
A)  damages molecules irreversibly. 
B)  is non-ionizing. 
C)  penetrates well. 
D)  destroys protein function, although DNA is undamaged. 
E)  is penetrating and causes extensive molecular damage.

Question 7

The phenol coefficient is one of the most widely used measurements of an antimicrobial agent's effectiveness.

Accepted Answer

A) True 
 B)False

Question 8

Microbial growth in jellies is inhibited by the (acidic/hypotonic/hypertonic)condition of the food.

Accepted Answer

The answer of Microbial growth in jellies is inhibited by...

Question 9

Heavy metal and oxidizing agent disinfectants damage (DNA/enzymes/membranes),interfering with microbial metabolism.

Accepted Answer

The answer of Heavy metal and oxidizing agent disinfectants damage...

Question 10

Methods of microbial control called ________ arrest the growth of microbes.

Accepted Answer

A)  microbicial 
B)  microbistatic 
C)  sanitizing 
D)  degerming 
E)  antiseptic 
A)  microbicial 
B)  microbistatic 
C)  sanitizing 
D)  degerming 
E)  antiseptic

Question 11

A chemical agent that dissolves lipids can damage

Accepted Answer

A)  cells. 
B)  bacterial endospores. 
C)  enveloped viruses. 
D)  nonenveloped and enveloped viruses. 
E)  cells and enveloped viruses. 
A)  cells. 
B)  bacterial endospores. 
C)  enveloped viruses. 
D)  nonenveloped and enveloped viruses. 
E)  cells and enveloped viruses.

Question 12

Quaternary ammonium compounds are disinfectants effective against

Accepted Answer

A)  endospores. 
B)  mycobacteria. 
C)  nonenveloped viruses. 
D)  Pseudomonas aeruginosa. 
E)  enveloped viruses. 
A)  endospores. 
B)  mycobacteria. 
C)  nonenveloped viruses. 
D)  Pseudomonas aeruginosa. 
E)  enveloped viruses.

Question 13

Which of the following procedures is currently the standard test used in the United States for evaluating the efficiency of antiseptics and disinfectants?

Accepted Answer

A)  use-dilution test 
B)  microbial death rate 
C)  in-use test 
D)  Kelsey-Sykes capacity test 
E)  phenol coefficient 
A)  use-dilution test 
B)  microbial death rate 
C)  in-use test 
D)  Kelsey-Sykes capacity test 
E)  phenol coefficient

Question 14

By themselves,soaps have only degerming activity,not antimicrobial activity.

Accepted Answer

A) True 
 B)False

Question 15

Disinfecting agents naturally produced by microorganisms are

Accepted Answer

A)  aldehydes. 
B)  antimicrobials. 
C)  halogens. 
D)  quats. 
E)  triclosans. 
A)  aldehydes. 
B)  antimicrobials. 
C)  halogens. 
D)  quats. 
E)  triclosans.

Question 16

The antimicrobial chemical pictured above in Figure 9.1 is a(n)(phenolic/surfactant/enzyme)compound found in many consumer products.

Accepted Answer

The answer of   
The antimicrobial chemical pictured above...

Question 17

Seventy percent alcohol is effective against

Accepted Answer

A)  enveloped viruses. 
B)  nonenveloped viruses. 
C)  bacterial endospores. 
D)  protozoan cysts. 
E)  prions. 
A)  enveloped viruses. 
B)  nonenveloped viruses. 
C)  bacterial endospores. 
D)  protozoan cysts. 
E)  prions.

Question 18

The microbial death rate is (constant/nonlinear/variable)over time.

Accepted Answer

The answer of The microbial death rate is (constant/nonlinear/variable)over time....

Question 19

Quaternary ammonium compounds ("quats")are used for

Accepted Answer

A)  antisepsis. 
B)  disinfection. 
C)  sterilization. 
D)  quantifying antimicrobial activity. 
E)  both antisepsis and disinfection. 
A)  antisepsis. 
B)  disinfection. 
C)  sterilization. 
D)  quantifying antimicrobial activity. 
E)  both antisepsis and disinfection.

Question 20

The physical removal of microbes is called (antisepsis/degerming/disinfection).

Accepted Answer

The answer of The physical removal of microbes is called...

Exam 9: Controlling Microbial Growth in the Environment

Hydrogen peroxide is an effective

Which of the following is used to sterilize items that should not,or cannot,be exposed to heat or water?

Which of the following is a sterilizing agent?

A scientist develops a new medication that is a protein compound and that must be administered by injection.Which of the following would be the most effective and safest means of preparing a sterile solution of the new medication?

Gamma irradiation is effective for sterilization because it

The phenol coefficient is one of the most widely used measurements of an antimicrobial agent's effectiveness.

Microbial growth in jellies is inhibited by the (acidic/hypotonic/hypertonic)condition of the food.

Heavy metal and oxidizing agent disinfectants damage (DNA/enzymes/membranes),interfering with microbial metabolism.

Methods of microbial control called ________ arrest the growth of microbes.

A chemical agent that dissolves lipids can damage

Quaternary ammonium compounds are disinfectants effective against

Which of the following procedures is currently the standard test used in the United States for evaluating the efficiency of antiseptics and disinfectants?

By themselves,soaps have only degerming activity,not antimicrobial activity.

Disinfecting agents naturally produced by microorganisms are

The antimicrobial chemical pictured above in Figure 9.1 is a(n)(phenolic/surfactant/enzyme)compound found in many consumer products.

Seventy percent alcohol is effective against

The microbial death rate is (constant/nonlinear/variable)over time.

Quaternary ammonium compounds ("quats")are used for

The physical removal of microbes is called (antisepsis/degerming/disinfection).

A Brief History of Microbiology

The Chemistry of Microbiology

Cell Structure and Function

Microscopy, Staining, and Classification

Microbial Metabolism

Microbial Nutrition and Growth

Microbial Genetics

Recombinant DNA Technology

Controlling Microbial Growth in the Body: Antimicrobial Drugs

Characterizing and Classifying Prokaryotes

Characterizing and Classifying Eukaryotes

Characterizing and Classifying Viruses, Viroids, and Prions

Infection, Infectious Diseases, and Epidemiology

Innate Immunity

Adaptive Immunity

Immunization and Immune Testing

Immune Disorders

Pathogenic Gram Positive Bacteria

Pathogenic Gram-Negative Cocci and Bacilli

Rickettsias, Chlamydias, Spirochetes, and Vibrios

Pathogenic Fungi

Parasitic Protozoa, Helminths, and Arthropod Vectors

Pathogenic DNA Viruses

Pathogenic RNA Viruses

Applied and Environmental Microbiology

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