Question 1

The two most important alcohol germicides are __________ and __________.

Accepted Answer

A)  ethanol; methanol 
B)  ethanol; isopropanol 
C)  methanol; butanol 
D)  methanol; isopropanol 
A)  ethanol; methanol 
B)  ethanol; isopropanol 
C)  methanol; butanol 
D)  methanol; isopropanol B

Question 2

Which of the following is true about membrane filters?

Accepted Answer

A)  It can be used only to remove organisms from liquids. 
B)  It does not truly sterilize because it removes rather than kills microorganisms. 
C)  It can be used only to remove organisms from liquids and it does not truly sterilize because it removes rather than kills microorganisms. 
D)  It can't be depended on to remove all viruses from liquids. 
A)  It can be used only to remove organisms from liquids. 
B)  It does not truly sterilize because it removes rather than kills microorganisms. 
C)  It can be used only to remove organisms from liquids and it does not truly sterilize because it removes rather than kills microorganisms. 
D)  It can't be depended on to remove all viruses from liquids. D

Question 3

Disinfectants are generally regulated by the

Accepted Answer

A)  Food and Drug Administration. 
B)  Environmental Protection Agency. 
C)  The National Institutes of Health. 
D)  Centers for Disease Control and Prevention. 
A)  Food and Drug Administration. 
B)  Environmental Protection Agency. 
C)  The National Institutes of Health. 
D)  Centers for Disease Control and Prevention. B

Question 4

The disinfecting properties of Lysol, a common household disinfectant, depend upon the presence of __________.

Accepted Answer

The answer of The disinfecting properties of Lysol, a common...

Question 5

An agent that prevents the growth of bacteria without causing irreversible damage to the bacteria is referred to as __________.

Accepted Answer

The answer of An agent that prevents the growth of...

Question 6

An agent that kills bacteria is referred to as __________.

Accepted Answer

The answer of An agent that kills bacteria is referred...

Question 7

The time required to kill 90% of the microorganisms or spores in a sample at a specified temperature is the

Accepted Answer

A)  thermal death time (TDT). 
B)  thermal death point (TDP). 
C)  decimal reduction time (D value). 
D)  z value. 
A)  thermal death time (TDT). 
B)  thermal death point (TDP). 
C)  decimal reduction time (D value). 
D)  z value.

Question 8

Microorganisms show differential sensitivity to antimicrobial agents.

Accepted Answer

A) True 
 B)False

Question 9

Antiseptics are generally regulated by the

Accepted Answer

A)  Food and Drug Administration. 
B)  Environmental Protection Agency. 
C)  The National Institutes of Health. 
D)  Centers for Disease Control and Prevention. 
A)  Food and Drug Administration. 
B)  Environmental Protection Agency. 
C)  The National Institutes of Health. 
D)  Centers for Disease Control and Prevention.

Question 10

Ultraviolet radiation is an effective means of sterilizing surfaces.

Accepted Answer

A) True 
 B)False

Question 11

Sterilization involves __________ all viable microorganisms.

Accepted Answer

A)  killing 
B)  removing 
C)  killing OR removing 
D)  metabolically inactivating 
A)  killing 
B)  removing 
C)  killing OR removing 
D)  metabolically inactivating

Question 12

Which of the following inhibits bacterial growth but does not kill bacteria

Accepted Answer

A)  lysozyme 
B)  bactericidal agent 
C)  bacteriostatic agent 
D)  antiseptic agent 
A)  lysozyme 
B)  bactericidal agent 
C)  bacteriostatic agent 
D)  antiseptic agent

Question 13

Which of the following environmental factors generally do(es) not have an impact on the efficiency of an antimicrobial agent?

Accepted Answer

A)  pH 
B)  presence or absence of a biofilm 
C)  concentration of organic matter 
D)  refractive index 
A)  pH 
B)  presence or absence of a biofilm 
C)  concentration of organic matter 
D)  refractive index

Question 14

Gamma radiation

Accepted Answer

A)  is a type of nonionizing radiation. 
B)  has poor penetrating power. 
C)  is used to sterilize some food products. 
D)  has a longer wavelength than UV radiation. 
A)  is a type of nonionizing radiation. 
B)  has poor penetrating power. 
C)  is used to sterilize some food products. 
D)  has a longer wavelength than UV radiation.

Question 15

Although heavy metals are no longer widely used as germicides, __________ is an effective algicide in lakes and swimming pools.

Accepted Answer

A)  lead acetate 
B)  copper sulfate 
C)  silver nitrate 
D)  mercuric chloride 
A)  lead acetate 
B)  copper sulfate 
C)  silver nitrate 
D)  mercuric chloride

Question 16

Joseph Lister

Accepted Answer

A)  pioneered the use of gamma rays for sterilizing food. 
B)  demonstrated that microorganisms are carried on dust particles in the air. 
C)  revolutionized surgery by introducing phenol as a disinfectant. 
D)  designed and built the first autoclave. 
A)  pioneered the use of gamma rays for sterilizing food. 
B)  demonstrated that microorganisms are carried on dust particles in the air. 
C)  revolutionized surgery by introducing phenol as a disinfectant. 
D)  designed and built the first autoclave.

Question 17

Which of the following is a function of pasteurization?

Accepted Answer

A)  killing pathogenic microorganisms 
B)  reducing the total microbial population 
C)  increasing the shelf life of the product 
D)  all of the choices 
A)  killing pathogenic microorganisms 
B)  reducing the total microbial population 
C)  increasing the shelf life of the product 
D)  all of the choices

Question 18

The type of filter used in a laminar flow biological safety cabinet is called a(n) __________ filter.

Accepted Answer

HEPA (high

Question 19

Because filtration removes rather than destroys microorganisms, it does not truly sterilize the materials passing through the filter.

Accepted Answer

A) True 
 B)False

Question 20

Which of these is an agent that is used to sterilize the plastic tubing of heart-lung machines?

Accepted Answer

A)  phenol 
B)  mercaptoethanol 
C)  ethylene oxide 
D)  70% ethanol 
A)  phenol 
B)  mercaptoethanol 
C)  ethylene oxide 
D)  70% ethanol

Exam 8: Control of Microorganisms in the Environment

The two most important alcohol germicides are __________ and __________.

Which of the following is true about membrane filters?

Disinfectants are generally regulated by the

The disinfecting properties of Lysol, a common household disinfectant, depend upon the presence of __________.

An agent that prevents the growth of bacteria without causing irreversible damage to the bacteria is referred to as __________.

An agent that kills bacteria is referred to as __________.

The time required to kill 90% of the microorganisms or spores in a sample at a specified temperature is the

Microorganisms show differential sensitivity to antimicrobial agents.

Antiseptics are generally regulated by the

Ultraviolet radiation is an effective means of sterilizing surfaces.

Sterilization involves __________ all viable microorganisms.

Which of the following inhibits bacterial growth but does not kill bacteria

Which of the following environmental factors generally do(es) not have an impact on the efficiency of an antimicrobial agent?

Gamma radiation

Although heavy metals are no longer widely used as germicides, __________ is an effective algicide in lakes and swimming pools.

Joseph Lister

Which of the following is a function of pasteurization?

The type of filter used in a laminar flow biological safety cabinet is called a(n) __________ filter.

Because filtration removes rather than destroys microorganisms, it does not truly sterilize the materials passing through the filter.

Which of these is an agent that is used to sterilize the plastic tubing of heart-lung machines?

The Evolution of Microorganisms and Microbiology

The Study of Microbial Structure: Microscopy and Specimen Preparation

Bacteria and Archaea

Eukaryotic Cell Structure and Function

Viruses and Other Acellular Infectious Agents

Microbial Nutrition

Microbial Growth

Introduction to Metabolism

Catabolism Energy Release and Conservation

Anabolism the Use of Energy in Biosynthesis

Genes Structure, Replication, and Expression

Microbial Genetics Regulation of Gene Expression

Microbial Genetics Mechanisms of Genetic Variation

Recombinant Dna Technology

Microbial Genomics

Microbial Taxonomy and the Evolution of Diversity

The Archaea

Bacteria the Deinococci and Nonproteobacteria Gram Negatives

Bacteria the Proteobacteria

Bacteria the Low G+C Gram Positives

Bacteria the High G+C Gram Positives

The Protists

The Fungi Eumycota

The Viruses

Biogeochemical Cycling

Methods in Microbial Ecology

Microorganisms in Marine and Freshwater Ecosystems

Microorganisms in Terrestrial Ecosystems

Microbial Interactions

Infection and Pathogenicity

Nonspecific Innate Host Resistance

Specific Adaptive Immunity

Antimicrobial Chemotherapy

Clinical Microbiology and Immunology

Epidemiology and Public Health Microbiology

Human Diseases Caused by Viruses and Prions

Human Diseases Caused by Bacteria

Human Diseases Caused by Fungi and Protists

Microbiology of Food

Industrial Microbiology

Applied Environmental Microbiology

Filters

The two most important alcohol germicides are and .