Question 1

Growth of a bacterium which contains a prophage represents a:

Accepted Answer

A) lytic cycle 
B) temperate cycle 
C) lysogenic cycle 
D) induction 
A) lytic cycle 
B) temperate cycle 
C) lysogenic cycle 
D) induction

Question 2

Enveloped animal viruses typically leave the host cell by:

Accepted Answer

A) host cell lysis 
B) host cell rupture 
C) budding 
D) animal viruses never leave the host cell 
A) host cell lysis 
B) host cell rupture 
C) budding 
D) animal viruses never leave the host cell

Question 3

Temperate phages:

Accepted Answer

A) do not always undergo a lytic cycle 
B) only replicate at certain temperatures 
C) are those that cause disease 
D) form plaques on bacterial lawns 
A) do not always undergo a lytic cycle 
B) only replicate at certain temperatures 
C) are those that cause disease 
D) form plaques on bacterial lawns

Question 4

Much of the information about how viruses work has been gleaned from studying T-even phages that infect:

Accepted Answer

A) bacteria 
B) human cells 
C) mammalian cells 
D) plant cells 
A) bacteria 
B) human cells 
C) mammalian cells 
D) plant cells

Question 5

Identify the portion of the growth curve that represents the time after penetration through the release of mature phages.

Accepted Answer

A) A 
B) B 
C) C 
A) A 
B) B 
C) C

Question 6

Viruses that have plus strand RNA chromosomes that acts as a template for DNA synthesis are known as:

Accepted Answer

A) retroviruses. 
B) proviruses. 
C) viroids. 
D) bacteriophages. 
E) lytic phages. 
A) retroviruses. 
B) proviruses. 
C) viroids. 
D) bacteriophages. 
E) lytic phages.

Question 7

Diseases such as Creutzfeld-Jacob disease (variant),kuru,and mad cow disease are caused by:

Accepted Answer

A) RNA viruses 
B) DNA viruses 
C) bacteria 
D) prions 
A) RNA viruses 
B) DNA viruses 
C) bacteria 
D) prions

Question 8

Cells taken directly from an animal and cultured in vitro represent:

Accepted Answer

A) primary cell cultures 
B) diploid fibroblast strains 
C) continuous cell lines from human embryos 
D) continuous cell lines that have been re-isolated from animal tissues 
A) primary cell cultures 
B) diploid fibroblast strains 
C) continuous cell lines from human embryos 
D) continuous cell lines that have been re-isolated from animal tissues

Question 9

Select the true statement regarding yellow fever.

Accepted Answer

A) Yellow fever is endemic to the United States. 
B) Yellow fever is only transmitted by one mosquito species. 
C) Yellow fever is transmitted by ticks and mosquitoes. 
D) Yellow fever is caused by a flavivirus. 
A) Yellow fever is endemic to the United States. 
B) Yellow fever is only transmitted by one mosquito species. 
C) Yellow fever is transmitted by ticks and mosquitoes. 
D) Yellow fever is caused by a flavivirus.

Question 10

A virus that is specific for a bacterial host is called a:

Accepted Answer

A) phage 
B) prion 
C) viroid 
D) virion 
A) phage 
B) prion 
C) viroid 
D) virion

Question 11

Viruses are referred to as obligate intracellular parasites because:

Accepted Answer

A) viral DNA inserts itself into host DNA. 
B) they reproduce and then exit the cell. 
C) they use the host's energy to live. 
D) they must use the host's machinery to synthesize components required for assembly into new virus particles. 
A) viral DNA inserts itself into host DNA. 
B) they reproduce and then exit the cell. 
C) they use the host's energy to live. 
D) they must use the host's machinery to synthesize components required for assembly into new virus particles.

Question 12

In the early 1990s,this emerging virus was of concern to the United States.It is transmitted from rodent feces and urine to human beings.This emerging virus is the:

Accepted Answer

A) influenza virus 
B) rhinovirus 
C) hantavirus 
D) poliovirus 
A) influenza virus 
B) rhinovirus 
C) hantavirus 
D) poliovirus

Question 13

The scientist who discovered that some viruses may cause cancer is:

Accepted Answer

A) Diener 
B) Rous 
C) Prusiner 
D) Prioux 
A) Diener 
B) Rous 
C) Prusiner 
D) Prioux

Question 14

Which of the following would be the best host system to study influenza A viruses

Accepted Answer

A) Primary cell culture 
B) Diploid fibroblast strain 
C) Continuous cell line 
D) Embryonated chicken egg 
A) Primary cell culture 
B) Diploid fibroblast strain 
C) Continuous cell line 
D) Embryonated chicken egg

Question 15

Which is the best scientific explanation for the increasing concern over the recent outbreaks of avian influenza in Hong Kong and other Asian locations

Accepted Answer

A) avian influenza may infect humans. 
B) human influenza viruses may exchange genetic material with avian influenza viruses and infect humans more efficiently. 
C) avian influenza may spread to other countries. 
D) avian influenza may change to another virus that could infect humans. 
A) avian influenza may infect humans. 
B) human influenza viruses may exchange genetic material with avian influenza viruses and infect humans more efficiently. 
C) avian influenza may spread to other countries. 
D) avian influenza may change to another virus that could infect humans.

Question 16

Viruses have some of the properties of cellular life forms.Which of the following is a characteristic of all organisms except viruses

Accepted Answer

A) presence of a plasma membrane 
B) capable of mutation 
C) ability to reproduce inside a living host 
D) grow in response to their environment conditions 
A) presence of a plasma membrane 
B) capable of mutation 
C) ability to reproduce inside a living host 
D) grow in response to their environment conditions

Question 17

Viral DNA lying within a bacterial chromosome is called a ________ while the combination of a bacterial cell and its temperate phage is called a ________.

Accepted Answer

A) prophage,lysogen 
B) plaque,lysogen 
C) lysogen,prophage 
D) prophage,retrovirus 
A) prophage,lysogen 
B) plaque,lysogen 
C) lysogen,prophage 
D) prophage,retrovirus

Question 18

The reason that retroviruses can direct the formation of DNA from RNA is because most retroviruses contain the following enzyme

Accepted Answer

A) RNA polymerase. 
B) DNA polymerase. 
C) DNA ligase. 
D) reverse transcriptase. 
A) RNA polymerase. 
B) DNA polymerase. 
C) DNA ligase. 
D) reverse transcriptase.

Question 19

A naked virus:

Accepted Answer

A) has no protein coat around its nucleic acid. 
B) is unable to attach itself to a host cell. 
C) has no envelope. 
D) has no infectious piece of DNA. 
A) has no protein coat around its nucleic acid. 
B) is unable to attach itself to a host cell. 
C) has no envelope. 
D) has no infectious piece of DNA.

Question 20

Prophages are responsible for production of the toxins found in:

Accepted Answer

A) Staphylococcus aureus 
B) Micrococcus luteus 
C) Clostridium botulinum 
D) Streptococcus lactis 
A) Staphylococcus aureus 
B) Micrococcus luteus 
C) Clostridium botulinum 
D) Streptococcus lactis

Exam 11: Viruses

Growth of a bacterium which contains a prophage represents a:

Enveloped animal viruses typically leave the host cell by:

Temperate phages:

Much of the information about how viruses work has been gleaned from studying T-even phages that infect:

Identify the portion of the growth curve that represents the time after penetration through the release of mature phages.

Viruses that have plus strand RNA chromosomes that acts as a template for DNA synthesis are known as:

Diseases such as Creutzfeld-Jacob disease (variant),kuru,and mad cow disease are caused by:

Cells taken directly from an animal and cultured in vitro represent:

Select the true statement regarding yellow fever.

A virus that is specific for a bacterial host is called a:

Viruses are referred to as obligate intracellular parasites because:

In the early 1990s,this emerging virus was of concern to the United States.It is transmitted from rodent feces and urine to human beings.This emerging virus is the:

The scientist who discovered that some viruses may cause cancer is:

Which of the following would be the best host system to study influenza A viruses

Which is the best scientific explanation for the increasing concern over the recent outbreaks of avian influenza in Hong Kong and other Asian locations

Viruses have some of the properties of cellular life forms.Which of the following is a characteristic of all organisms except viruses

Viral DNA lying within a bacterial chromosome is called a ________ while the combination of a bacterial cell and its temperate phage is called a ________.

The reason that retroviruses can direct the formation of DNA from RNA is because most retroviruses contain the following enzyme

A naked virus:

Prophages are responsible for production of the toxins found in:

Scope and History of Microbiology

The Microbiome

Fundamentals of Chemistry

Microscopy and Staining

Characteristics of Prokaryotic and Eukaryotic Cells

Essential Concepts of Metabolism

Growth and Culturing of Bacteria

Microbial Genetics

Gene Transfer and Genetic Engineering

An Introduction to Taxonomy: The Bacteria

Eukaryotic Microorganisms and Parasites

Sterilization and Disinfection

Antimicrobial Therapy

Host-Microbe Relationships and Disease Processes

Epidemiology and Nosocomial Infections

Innate Host Defenses

Basic Principles of Adaptive Immunity and Immunization

Immune Disorders

Diseases of the Skin and Eyes; Wounds and Bites

Urogenital and Sexually Transmitted Diseases

Diseases of the Respiratory System

Oral and Gastrointestinal Diseases

Cardiovascular, Lymphatic, and Systemic Diseases

Diseases of the Nervous System

Environmental Microbiology

Applied Microbiology

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Viral DNA lying within a bacterial chromosome is called a while the combination of a bacterial cell and its temperate phage is called a .