Question 1

Visible, clear, well-defined patches in a monolayer of virus-infected cells in a culture are called

Accepted Answer

A)  lysogeny. 
B)  budding. 
C)  plaques. 
D)  pocks. 
A)  lysogeny. 
B)  budding. 
C)  plaques. 
D)  pocks.

Question 2

Viruses with _____ sense RNA contain the correct message for translation, while viruses with _____ sense RNA must first be converted into a correct message.

Accepted Answer

The answer of Viruses with _____ sense RNA contain the...

Question 3

Discuss theories regarding the origins of viruses and make a case for whether viruses originated before cellular life-forms or after cellular life-forms.

Accepted Answer

The origins of viruses have been a topic

Question 4

When a virus enters a host cell, the viral genes redirect the genetic and metabolic activities of the host cell.

Accepted Answer

A) True 
 B)False

Question 5

Discuss the criteria used for classifying viruses into families and genera.

Accepted Answer

Viruses are classified into families and

Question 6

The nucleocapsid consists of

Accepted Answer

A)  the capsomers assembled into the capsid. 
B)  the nucleic acid of the virus only. 
C)  the nucleic acid along with the capsid. 
D)  the envelope and capsid. 
E)  the envelope, nucleic acid, and capsid. 
A)  the capsomers assembled into the capsid. 
B)  the nucleic acid of the virus only. 
C)  the nucleic acid along with the capsid. 
D)  the envelope and capsid. 
E)  the envelope, nucleic acid, and capsid.

Question 7

When a virus enters a lysogenic phase, it means

Accepted Answer

A)  the virus is integrated into the DNA of the host cell and is latent. 
B)  the virus is bursting through the host cell membrane. 
C)  the virus is starting biosynthesis of its nucleic acid. 
D)  the virus will remain in circulation and not continue infecting its host. 
E)  the number of viruses in the host is decreasing as the immune system becomes effective. 
A)  the virus is integrated into the DNA of the host cell and is latent. 
B)  the virus is bursting through the host cell membrane. 
C)  the virus is starting biosynthesis of its nucleic acid. 
D)  the virus will remain in circulation and not continue infecting its host. 
E)  the number of viruses in the host is decreasing as the immune system becomes effective.

Question 8

Explain what is meant by host range, what governs host range, and what is meant by tissue tropism.

Accepted Answer

Host range refers to the range of differ

Question 9

The Adeno-Associated Virus AAV) and the Delta Agent are prions.

Accepted Answer

A) True 
 B)False

Question 10

All of the following are characteristics of viruses except

Accepted Answer

A)  definite shape. 
B)  metabolism. 
C)  genes. 
D)  ability to infect host cells. 
E)  ultramicroscopic size. 
A)  definite shape. 
B)  metabolism. 
C)  genes. 
D)  ability to infect host cells. 
E)  ultramicroscopic size.

Question 11

When used in a description of viruses, the term replication includes

Accepted Answer

A)  the production of multiple copies of a virus by a host cell. 
B)  the copying of the viral DNA in a DNA virus. 
C)  the copying of the genomic RNA in an RNA virus. 
D)  All of these choices are correct. 
A)  the production of multiple copies of a virus by a host cell. 
B)  the copying of the viral DNA in a DNA virus. 
C)  the copying of the genomic RNA in an RNA virus. 
D)  All of these choices are correct.

Question 12

Viral growth in bird embryos can cause discrete, opaque spots in the embryonic membranes called

Accepted Answer

A)  lysogeny. 
B)  budding. 
C)  plaques. 
D)  cytopathic effects. 
E)  pocks. 
A)  lysogeny. 
B)  budding. 
C)  plaques. 
D)  cytopathic effects. 
E)  pocks.

Question 13

Which of the following viral types enter animal cells via fusion with the animal cell membrane?

Accepted Answer

A)  enveloped viruses 
B)  non enveloped viruses 
C)  naked viruses 
D)  All of these choices are correct. 
A)  enveloped viruses 
B)  non enveloped viruses 
C)  naked viruses 
D)  All of these choices are correct.

Question 14

Satellite viruses are

Accepted Answer

A)  also called viroids. 
B)  dependent on other viruses for replication. 
C)  the cause of spongiform encephalopathies. 
D)  significant pathogens of plants. 
E)  All of these choices are correct. 
A)  also called viroids. 
B)  dependent on other viruses for replication. 
C)  the cause of spongiform encephalopathies. 
D)  significant pathogens of plants. 
E)  All of these choices are correct.

Question 15

T-even phages

Accepted Answer

A)  include the poxviruses. 
B)  infect Escherichia coli cells. 
C)  enter host cells by engulfment. 
D)  have helical capsids. 
E)  All of these choices are correct. 
A)  include the poxviruses. 
B)  infect Escherichia coli cells. 
C)  enter host cells by engulfment. 
D)  have helical capsids. 
E)  All of these choices are correct.

Question 16

Oncogenic viruses include all the following except

Accepted Answer

A)  Hepatitis B virus. 
B)  Measles virus. 
C)  Papillomavirus. 
D)  HTLVI and HTLVII viruses. 
E)  Epstein-Barr virus. 
A)  Hepatitis B virus. 
B)  Measles virus. 
C)  Papillomavirus. 
D)  HTLVI and HTLVII viruses. 
E)  Epstein-Barr virus.

Question 17

No cases of variant Creutzfeldt-Jakob syndrome linked to eating infected cows have occurred in the United States.

Accepted Answer

A) True 
 B)False

Question 18

A common method for cultivating viruses in the lab is to use in vitro systems called _____ cultures.

Accepted Answer

The answer of A common method for cultivating viruses in...

Question 19

The three basic groups of viruses based on morphology include

Accepted Answer

A)  enveloped viruses, non enveloped viruses, and complex viruses. 
B)  enveloped viruses, DNA viruses, and non enveloped viruses. 
C)  helical viruses, round viruses, and enveloped viruses. 
D)  non enveloped viruses, RNA viruses, and bacteriophages. 
A)  enveloped viruses, non enveloped viruses, and complex viruses. 
B)  enveloped viruses, DNA viruses, and non enveloped viruses. 
C)  helical viruses, round viruses, and enveloped viruses. 
D)  non enveloped viruses, RNA viruses, and bacteriophages.

Question 20

Host cells of viruses include

Accepted Answer

A)  human and other animals. 
B)  plants and fungi. 
C)  bacteria. 
D)  protozoa and algae. 
E)  All of these choices are correct. 
A)  human and other animals. 
B)  plants and fungi. 
C)  bacteria. 
D)  protozoa and algae. 
E)  All of these choices are correct.

Exam 6: An Introduction to Viruses

Visible, clear, well-defined patches in a monolayer of virus-infected cells in a culture are called

Viruses with _____ sense RNA contain the correct message for translation, while viruses with _____ sense RNA must first be converted into a correct message.

Discuss theories regarding the origins of viruses and make a case for whether viruses originated before cellular life-forms or after cellular life-forms.

When a virus enters a host cell, the viral genes redirect the genetic and metabolic activities of the host cell.

Discuss the criteria used for classifying viruses into families and genera.

The nucleocapsid consists of

When a virus enters a lysogenic phase, it means

Explain what is meant by host range, what governs host range, and what is meant by tissue tropism.

The Adeno-Associated Virus AAV) and the Delta Agent are prions.

All of the following are characteristics of viruses except

When used in a description of viruses, the term replication includes

Viral growth in bird embryos can cause discrete, opaque spots in the embryonic membranes called

Which of the following viral types enter animal cells via fusion with the animal cell membrane?

Satellite viruses are

T-even phages

Oncogenic viruses include all the following except

No cases of variant Creutzfeldt-Jakob syndrome linked to eating infected cows have occurred in the United States.

A common method for cultivating viruses in the lab is to use in vitro systems called _____ cultures.

The three basic groups of viruses based on morphology include

Host cells of viruses include

The Main Themes of Microbiology

The Chemistry of Biology

Tools of the Laboratory: Methods of Studying Microorganisms

A Survey of Prokaryotic Cells and Microorganisms

A Survey of Eukaryotic Cells and Microorganisms

Microbial Nutrition, Ecology, and Growth

An Introduction to Microbial Metabolism: the Chemical Crossroads of Life

Microbial Genetics

Genetic Engineering: a Revolution in Molecular Biology

Physical and Chemical Agents for Microbial Control

Drugs, Microbes, Host--The Elements of Chemotherapy

Microbe-Human Interactions: Infection and Disease

An Introduction to Host Defenses and Innate Immunities

Adaptive, Specific Immunity and Immunization

Disorders in Immunity

Procedures for Identifying Pathogens and Diagnosing Infections

The Gram-Positive and Gram-Negative Cocci of Medical Importance

The Gram-Positive Bacilli of Medical Importance

The Gram-Negative Bacilli of Medical Importance

Miscellaneous Bacterial Agents of Disease

The Fungi of Medical Importance

The Parasites of Medical Importance

Introduction to Viruses That Infect Humans: the Dna Viruses

The Rna Viruses That Infect Humans

Environmental Microbiology

Applied and Industrial Microbiology

Filters

Viruses with _ sense RNA contain the correct message for translation, while viruses with _ sense RNA must first be converted into a correct message.