Question 1

Agents that can denature microbial proteins include all of the following except

Accepted Answer

A) moist heat. 
B) alcohol. 
C) acids. 
D) metallic ions. 
E) X rays. 
A) moist heat. 
B) alcohol. 
C) acids. 
D) metallic ions. 
E) X rays.

Question 2

Which of the following does not affect microbial nucleic acids?

Accepted Answer

A) moist heat 
B) ultraviolet light 
C) X rays 
D) ethylene dioxide 
E) formaldehyde 
A) moist heat 
B) ultraviolet light 
C) X rays 
D) ethylene dioxide 
E) formaldehyde

Question 3

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

Question 4

Which is correct regarding the rate of microbial death?

Accepted Answer

A) Cells die at increasingly greater rates. 
B) Only older cells die in a culture. 
C) Cells in a culture die at a constant rate. 
D) Upon contact with the control agent,all cells die at one time. 
E) Cells become metabolically inactive but are never killed. 
A) Cells die at increasingly greater rates. 
B) Only older cells die in a culture. 
C) Cells in a culture die at a constant rate. 
D) Upon contact with the control agent,all cells die at one time. 
E) Cells become metabolically inactive but are never killed.

Question 5

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

Accepted Answer

A) True 
 B)False

Question 6

Vials of microorganisms that undergo the freeze-drying process called _____,will remain preserved and viable for years.

Accepted Answer

A) desiccation 
B) flash freeze 
C) lyophilization 
D) pasteurization 
E) sterilization 
A) desiccation 
B) flash freeze 
C) lyophilization 
D) pasteurization 
E) sterilization

Question 7

Which of the following represents the use of osmotic pressure as a microbial control method?

Accepted Answer

A) bleaching a kitchen counter 
B) salting of meat 
C) rinsing of a cut with Betadine 
D) exposing dental equipment to UV light 
A) bleaching a kitchen counter 
B) salting of meat 
C) rinsing of a cut with Betadine 
D) exposing dental equipment to UV light

Question 8

Microbicidal agents are sterilants.

Accepted Answer

A) True 
 B)False

Question 9

All of the following act as surfactants except

Accepted Answer

A) detergents. 
B) soaps. 
C) quaternary ammonia. 
D) alcohols. 
E) iodine. 
A) detergents. 
B) soaps. 
C) quaternary ammonia. 
D) alcohols. 
E) iodine.

Question 10

_____ is a control method that removes microorganisms rather than inhibiting or killing them.

Accepted Answer

A) Boiling 
B) Sterilization 
C) Radiation 
D) Filtration 
E) Disinfection 
A) Boiling 
B) Sterilization 
C) Radiation 
D) Filtration 
E) Disinfection

Question 11

HEPA filters are used to remove microbes from

Accepted Answer

A) air. 
B) liquids. 
C) human tissues. 
D) medical instruments. 
E) All of the choices are correct. 
A) air. 
B) liquids. 
C) human tissues. 
D) medical instruments. 
E) All of the choices are correct.

Question 12

Which of the following is not a factor that affects germicidal activity?

Accepted Answer

A) material being treated 
B) length of exposure 
C) strength of the germicide 
D) microorganism being treated 
E) All of the choices are factors. 
A) material being treated 
B) length of exposure 
C) strength of the germicide 
D) microorganism being treated 
E) All of the choices are factors.

Question 13

Hydrogen peroxide is used in the process of sterilizing instruments such as endoscopes.

Accepted Answer

A) True 
 B)False

Question 14

Heavy metals work by

Accepted Answer

A) rupturing the cell membrane. 
B) inactivating proteins. 
C) binding to DNA. 
D) dissolving the cell wall. 
E) mutating DNA. 
A) rupturing the cell membrane. 
B) inactivating proteins. 
C) binding to DNA. 
D) dissolving the cell wall. 
E) mutating DNA.

Question 15

The alcohol wipe used on a patient's skin before an injection is an example of

Accepted Answer

A) antisepsis. 
B) disinfection. 
C) sterilization. 
D) decontamination. 
E) sanitization. 
A) antisepsis. 
B) disinfection. 
C) sterilization. 
D) decontamination. 
E) sanitization.

Question 16

The removal of all life forms from inanimate objects is termed

Accepted Answer

A) antisepsis. 
B) disinfection. 
C) sterilization. 
D) decontamination. 
E) degerming. 
A) antisepsis. 
B) disinfection. 
C) sterilization. 
D) decontamination. 
E) degerming.

Question 17

Some microbial control agents are able to _____ cell proteins by breaking bonds that maintain the native state,the three-dimensional configuration of the proteins.

Accepted Answer

A) denature 
B) bind 
C) dissolve 
D) mutate 
A) denature 
B) bind 
C) dissolve 
D) mutate

Question 18

The sterilizing gas used in chemiclaves is

Accepted Answer

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

Question 19

Electrons are ejected from atoms in cells when organisms are exposed to

Accepted Answer

A) desiccation. 
B) ultraviolet light. 
C) ethyl alcohol. 
D) hydrogen peroxide. 
E) gamma rays and X rays. 
A) desiccation. 
B) ultraviolet light. 
C) ethyl alcohol. 
D) hydrogen peroxide. 
E) gamma rays and X rays.

Question 20

Microbial death occurs when there is

Accepted Answer

A) no movement. 
B) no reproduction. 
C) a change in appearance. 
D) a decrease in size. 
E) All of the choices occur. 
A) no movement. 
B) no reproduction. 
C) a change in appearance. 
D) a decrease in size. 
E) All of the choices occur.

Exam 11: Physical and Chemical Control of Microbes

Agents that can denature microbial proteins include all of the following except

Which of the following does not affect microbial nucleic acids?

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

Which is correct regarding the rate of microbial death?

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

Vials of microorganisms that undergo the freeze-drying process called _____,will remain preserved and viable for years.

Which of the following represents the use of osmotic pressure as a microbial control method?

Microbicidal agents are sterilants.

All of the following act as surfactants except

_____ is a control method that removes microorganisms rather than inhibiting or killing them.

HEPA filters are used to remove microbes from

Which of the following is not a factor that affects germicidal activity?

Hydrogen peroxide is used in the process of sterilizing instruments such as endoscopes.

Heavy metals work by

The alcohol wipe used on a patient's skin before an injection is an example of

The removal of all life forms from inanimate objects is termed

Some microbial control agents are able to _____ cell proteins by breaking bonds that maintain the native state,the three-dimensional configuration of the proteins.

The sterilizing gas used in chemiclaves is

Electrons are ejected from atoms in cells when organisms are exposed to

Microbial death occurs when there is

The Main Themes of Microbiology

The Chemistry of Biology

Tools of the Laboratory: Methods for the Culturing of Microscopic Analysis of Microorganisms

Prokaryotic Profiles: The Bacteria and Archaea

Eukaryotic Cells and Microorganisms

An Introduction to the Viruses

Microbial Nutrition, Ecology, and Growth

Microbial Metabolism: the Chemical Crossroads of Life

Microbial Genetics

Genetic Engineering and Recombinant Dna

Drugs, Microbes, host-The Elements of Chemotherapy

Microbe-Human Interactions: Infection and Disease

Host Defenses I: Overview and Nonspecific Defenses

Host Defenses II: Specific Immunity and Immunization

Disorders in Immunity

Diagnosing Infections

Infectious Diseases Affecting the Skin and Eyes

Infectious Diseases Affecting the Nervous System

Infectious Diseases Affecting the Cardiovascular and Lymphatic Systems

Infectious Diseases Affecting the Respiratory System

Infectious Diseases Affecting the Gastrointestinal Tract

Infectious Diseases Affecting the Genitourinary System

Microbes and the Environment

Applied Microbiology and Food and Water Safety

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