Question 1

Pasteurization is used to

Accepted Answer

A) Kill any pathogens present. 
B) Retard spoilage. 
C) Sterilize beverages. 
D) Kill any pathogens present and retard spoilage. 
A) Kill any pathogens present. 
B) Retard spoilage. 
C) Sterilize beverages. 
D) Kill any pathogens present and retard spoilage.

Question 2

Microorganisms show differential sensitivity to antimicrobial agents.

Accepted Answer

A) True 
 B)False

Question 3

The disinfectant of choice for municipal water supplies is __________.

Accepted Answer

A) fluorine 
B) chlorine 
C) either fluorine or chlorine 
D) ultraviolet light 
A) fluorine 
B) chlorine 
C) either fluorine or chlorine 
D) ultraviolet light

Question 4

Which of the following represents the best definition for microbial death?

Accepted Answer

A) The organism will not grow on minimal medium. 
B) The organism will not grow on a medium that normally supports its growth. 
C) The organism no longer retains its original shape and structures. 
D) None of these adequately describe microbial death. 
A) The organism will not grow on minimal medium. 
B) The organism will not grow on a medium that normally supports its growth. 
C) The organism no longer retains its original shape and structures. 
D) None of these adequately describe microbial death.

Question 5

A(n)__________ is a chemical that can be used to sterilize materials.

Accepted Answer

A) oxidant 
B) disinfectant 
C) antiseptic 
D) sterilant 
A) oxidant 
B) disinfectant 
C) antiseptic 
D) sterilant

Question 6

Bacteriophage therapy was developed after antibiotics were first discovered and used for treating bacterial infections.

Accepted Answer

A) True 
 B)False

Question 7

Amphipathic organic molecules that serve as disinfectants by disrupting membranes and denaturing proteins are called

Accepted Answer

A) sterilants. 
B) oxidants. 
C) detergents. 
D) soaps. 
A) sterilants. 
B) oxidants. 
C) detergents. 
D) soaps.

Question 8

Moist heat sterilization at 100$\degree$C kills all of the following except

Accepted Answer

A) bacterial endospores. 
B) fungal spores. 
C) viruses. 
D) bacterial endospores and fungal spores. 
A) bacterial endospores. 
B) fungal spores. 
C) viruses. 
D) bacterial endospores and fungal spores.

Question 9

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 10

When comparing dry heat and moist heat sterilization,dry heat is

Accepted Answer

A) faster. 
B) slower. 
C) equally as fast. 
D) sometimes faster but sometimes slower. 
A) faster. 
B) slower. 
C) equally as fast. 
D) sometimes faster but sometimes slower.

Question 11

Heavy metals are effective antimicrobial agents but are not widely used because of their high toxicity to humans.

Accepted Answer

A) True 
 B)False

Question 12

Alcohols are widely used as antiseptics and disinfectants because they are effective against endospores as well as vegetative cells.

Accepted Answer

A) True 
 B)False

Question 13

When antiseptics and disinfectants are compared,antiseptics are generally

Accepted Answer

A) less toxic. 
B) more toxic. 
C) equally as toxic. 
D) unpredictable in toxicity. 
A) less toxic. 
B) more toxic. 
C) equally as toxic. 
D) unpredictable in toxicity.

Question 14

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 15

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 16

Which of the following lacks sufficient penetrating power for bulk sterilization?

Accepted Answer

A) Ultraviolet (UV)radiation at 260 nm. 
B) X rays. 
C) Gamma radiation. 
D) Alpha and beta particles. 
A) Ultraviolet (UV)radiation at 260 nm. 
B) X rays. 
C) Gamma radiation. 
D) Alpha and beta particles.

Question 17

Larger populations generally are killed as rapidly as smaller populations.

Accepted Answer

A) True 
 B)False

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

Which of the following is not a method of heat sterilization?

Accepted Answer

A) Autoclaving. 
B) Incineration. 
C) Pasteurization. 
D) Heating in a dry air oven. 
A) Autoclaving. 
B) Incineration. 
C) Pasteurization. 
D) Heating in a dry air oven.

Question 20

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 household...

Exam 8: Control of Microorganisms in the Environment

Pasteurization is used to

Microorganisms show differential sensitivity to antimicrobial agents.

The disinfectant of choice for municipal water supplies is __________.

Which of the following represents the best definition for microbial death?

A(n)__________ is a chemical that can be used to sterilize materials.

Bacteriophage therapy was developed after antibiotics were first discovered and used for treating bacterial infections.

Amphipathic organic molecules that serve as disinfectants by disrupting membranes and denaturing proteins are called

Moist heat sterilization at 100 °\degree° C kills all of the following except

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

When comparing dry heat and moist heat sterilization,dry heat is

Heavy metals are effective antimicrobial agents but are not widely used because of their high toxicity to humans.

Alcohols are widely used as antiseptics and disinfectants because they are effective against endospores as well as vegetative cells.

When antiseptics and disinfectants are compared,antiseptics are generally

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

Sterilization involves __________ all viable microorganisms.

Which of the following lacks sufficient penetrating power for bulk sterilization?

Larger populations generally are killed as rapidly as smaller populations.

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

Which of the following is not a method of heat sterilization?

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

The Evolution of Microorganisms and Microbiology

Microscopy

Bacterial Cell Structure

Archaeal Cell Structure

Eukaryotic Cell Structure

Viruses and Other Acellular Infectious Agents

Microbial Growth

Antimicrobial Chemotherapy

Introduction to Metabolism

Catabolism: Energy Release and Conservation

Anabolism: the Use of Energy in Biosynthesis

Bacterial Genome Replication and Expression

Regulation of Bacterial Cellular Processes

Eukaryotic and Archaeal Genome Replication and Expression

Mechanisms of Genetic Variation

Recombinant Dna Technology

Microbial Genomics

Microbial Taxonomy and the Evolution of Diversity

The Archaea

The Deinococci,mollicutes,and Nonproteobacterial Gram-Negative Bacteria

The Proteobacteria

Firmicutes: the Low G 1 C Gram-Positive Bacteria

Actinobacteria: the High G 1 C Gram-Positive Bacteria

The Protists

The Fungi Eumycota

Viruses

Biogeochemical Cycling and Global Climate Change

Methods in Microbial Ecology

Microorganisms in Marine and Freshwater Ecosystems

Microorganisms in Terrestrial Ecosystems

Microbial Interactions

Innate Host Resistance

Adaptive Immunity

Pathogenicity and Infection

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

Biotechnology and Industrial Microbiology

Applied Environmental Microbiology

Filters

Moist heat sterilization at 100 $\degree$ C kills all of the following except