Question 1

Which of the following are the hosts for most enveloped viruses?

Accepted Answer

A) Bacteria 
B) animals 
C) Archaea 
D) fungi 
A) Bacteria 
B) animals 
C) Archaea 
D) fungi

Question 2

Viruses have both an intracellular and an extracellular form.

Accepted Answer

A) True 
 B)False

Question 3

Why was the discovery of retroviruses important to the field of molecular biology?

Accepted Answer

The discovery of retroviruses was import

Question 4

Most of the genetic diversity on earth resides in viral genomes.

Accepted Answer

A) True 
 B)False

Question 5

Restriction is

Accepted Answer

A) the viral process whereby a host's DNA ceases normal functioning. 
B) the viral process whereby the virus prevents other viruses from entering the cell. 
C) a general host mechanism to prevent the invasion of foreign nucleic acid. 
D) a general host mechanism to prevent virus particles from further infective action. 
A) the viral process whereby a host's DNA ceases normal functioning. 
B) the viral process whereby the virus prevents other viruses from entering the cell. 
C) a general host mechanism to prevent the invasion of foreign nucleic acid. 
D) a general host mechanism to prevent virus particles from further infective action.

Question 6

Regarding the viral membrane of an enveloped virus,the lipids are derived from the ________,and the proteins are encoded by ________.

Accepted Answer

A) host's cell membrane / viral genes 
B) virion / viral genes 
C) host's cell membrane / host's genes 
D) virion / host's genes 
A) host's cell membrane / viral genes 
B) virion / viral genes 
C) host's cell membrane / host's genes 
D) virion / host's genes

Question 7

Viruses can confer additional properties on their host cells,which can in turn be inherited.

Accepted Answer

A) True 
 B)False

Question 8

A temperate virus does not exist as a virus particle inside the host cell.

Accepted Answer

A) True 
 B)False

Question 9

The virus repressor protein

Accepted Answer

A) controls the prophage's lytic genes but not the incoming genomes of the same virus. 
B) does not control the prophage's lytic genes but does control the incoming genomes of the same virus. 
C) controls both the lytic genes on the prophage and prevents an incoming virus of the same type. 
D) has different actions in different situations. 
A) controls the prophage's lytic genes but not the incoming genomes of the same virus. 
B) does not control the prophage's lytic genes but does control the incoming genomes of the same virus. 
C) controls both the lytic genes on the prophage and prevents an incoming virus of the same type. 
D) has different actions in different situations.

Question 10

RNA replicase is found in ALL viruses to allow the replication and transcription of viral RNA instead of host RNA.

Accepted Answer

A) True 
 B)False

Question 11

Some viruses possess icosahedral heads and helical tails.

Accepted Answer

A) True 
 B)False

Question 12

For bacteriophages and animal viruses ________ is the step in the viral life cycle that determines host cell or tissue specificity.

Accepted Answer

A) attachment 
B) penetration 
C) synthesis 
D) assembly 
A) attachment 
B) penetration 
C) synthesis 
D) assembly

Question 13

ALL viral particles

Accepted Answer

A) are metabolically inert. 
B) are smaller than bacterial cells. 
C) contain an envelope to prevent its degradation outside of a host. 
D) exhibit cell lysis under a particular condition. 
A) are metabolically inert. 
B) are smaller than bacterial cells. 
C) contain an envelope to prevent its degradation outside of a host. 
D) exhibit cell lysis under a particular condition.

Question 14

Explain why some viruses contain enzymes within the virion and others do not.Use specific examples to support your answer.

Accepted Answer

In the example of retroviruses,the rever

Question 15

Cellular receptors may be composed of

Accepted Answer

A) proteins. 
B) carbohydrates. 
C) lipids. 
D) combinations of proteins,carbohydrates,and/or lipids. 
A) proteins. 
B) carbohydrates. 
C) lipids. 
D) combinations of proteins,carbohydrates,and/or lipids.

Question 16

The packaging mechanism of T4 DNA involves cutting of DNA from

Accepted Answer

A) linear genetic elements. 
B) circular genetic elements. 
C) DNA concatemers. 
D) its host cells. 
A) linear genetic elements. 
B) circular genetic elements. 
C) DNA concatemers. 
D) its host cells.

Question 17

In viruses,genetic information flows from ________ to ________.

Accepted Answer

A) RNA / virion 
B) nucleic acid / protein 
C) capsid / virion 
D) DNA / protein 
A) RNA / virion 
B) nucleic acid / protein 
C) capsid / virion 
D) DNA / protein

Question 18

Describe the establishment and maintenance of the lysogenic state in the lambda phage.

Accepted Answer

Lambda phage,once circularized by matchi

Question 19

Viruses infecting ________ are typically the easiest to grow in the laboratory.

Accepted Answer

A) plants 
B) animals 
C) fungi 
D) prokaryotes 
A) plants 
B) animals 
C) fungi 
D) prokaryotes

Question 20

Retroviruses are medically important viruses because

Accepted Answer

A) they include the viruses the cause hepatitis. 
B) some retroviruses cause cancer. 
C) they include the virus that causes AIDS. 
D) they include viruses that cause cancer and AIDS. 
A) they include the viruses the cause hepatitis. 
B) some retroviruses cause cancer. 
C) they include the virus that causes AIDS. 
D) they include viruses that cause cancer and AIDS.

Exam 8: Viruses and Virology

Which of the following are the hosts for most enveloped viruses?

Viruses have both an intracellular and an extracellular form.

Why was the discovery of retroviruses important to the field of molecular biology?

Most of the genetic diversity on earth resides in viral genomes.

Restriction is

Regarding the viral membrane of an enveloped virus,the lipids are derived from the ________,and the proteins are encoded by ________.

Viruses can confer additional properties on their host cells,which can in turn be inherited.

A temperate virus does not exist as a virus particle inside the host cell.

The virus repressor protein

RNA replicase is found in ALL viruses to allow the replication and transcription of viral RNA instead of host RNA.

Some viruses possess icosahedral heads and helical tails.

For bacteriophages and animal viruses ________ is the step in the viral life cycle that determines host cell or tissue specificity.

ALL viral particles

Explain why some viruses contain enzymes within the virion and others do not.Use specific examples to support your answer.

Cellular receptors may be composed of

The packaging mechanism of T4 DNA involves cutting of DNA from

In viruses,genetic information flows from ________ to ________.

Describe the establishment and maintenance of the lysogenic state in the lambda phage.

Viruses infecting ________ are typically the easiest to grow in the laboratory.

Retroviruses are medically important viruses because

Microorganisms and Microbiology

Microbial Cell Structure and Function

Microbial Metabolism

Molecular Biology

Microbial Growth and Control

Microbial Genomics

Metabolic Regulation

Viral Genomes and Diversity

Genetics of Bacteria and Archaea

Genetic Engineering and Biotechnology

Microbial Evolution and Systematics

Metabolic Diversity of Microorganisms

Functional Diversity of Bacteria

Diversity of Bacteria

Diversity of Archaea

Diversity of Eukaryotic Microorganisms

Methods in Microbial Ecology

Microbial Ecosystems

Nutrient Cycles

Microbiology of the Built Environment

Microbial Symbioses

Microbial Interactions With Humans

Immunity and Host Defense

Immune Mechanisms

Molecular Immunology

Diagnostic Microbiology

Epidemiology

Person-To-Person Bacterial and Viral Diseases

Vectorborne and Soilborne Bacterial and Viral Diseases

Water and Food As Vehicles of Bacterial Diseases

Eukaryotic Pathogens: Fungal and Parasitic Diseases

Filters

Regarding the viral membrane of an enveloped virus,the lipids are derived from the ,and the proteins are encoded by .

In viruses,genetic information flows from to .