Question 1

A bacteriophage that lacks its proteinaceous capsid structure is also called a viroid.

Accepted Answer

A) True 
 B)False  False

Question 2

The filamentous DNA phages are unusual,because they

Accepted Answer

A) are released from the host without the host being lysed. 
B) have linear genomes. 
C) replicate without a host. 
D) are released from the host without being lysed and have linear genomes. 
A) are released from the host without the host being lysed. 
B) have linear genomes. 
C) replicate without a host. 
D) are released from the host without being lysed and have linear genomes. A

Question 3

Blocking polyomavirus SV40's ability to integrate its genome into host cells would

Accepted Answer

A) avoid cancer development from the virus. 
B) increase the rate of transformation. 
C) increase the latent period of SV40. 
D) switch SV40 into a lytic lifecycle which would be especially harmful to the host cells. 
A) avoid cancer development from the virus. 
B) increase the rate of transformation. 
C) increase the latent period of SV40. 
D) switch SV40 into a lytic lifecycle which would be especially harmful to the host cells. A

Question 4

Bacteriophage that have single-stranded genomes are specialized to minimize energy requirements because just one strand is necessary for replication.

Accepted Answer

A) True 
 B)False

Question 5

The phage Mu

Accepted Answer

A) has a circular genome. 
B) repairs mutations in the host genome. 
C) replicates by transposition. 
D) has a circular genome,repairs host genome mutations,and can replicate by transposition. 
A) has a circular genome. 
B) repairs mutations in the host genome. 
C) replicates by transposition. 
D) has a circular genome,repairs host genome mutations,and can replicate by transposition.

Question 6

Many human-infecting viruses that illicit a strong immune response cause additional harmful effects on humans,so the discovery of a virus that can induce an immune response but not cause harm made it attractive for vaccine development.

Accepted Answer

A) True 
 B)False

Question 7

Viruses that contain positive-strand genomes are incompatible to share genetic elements other positive-strand genomes.

Accepted Answer

A) True 
 B)False

Question 8

The family of reoviruses contain dsRNA genomes that replicate from the template of ________ which makes it a ________ replication process.

Accepted Answer

A) only the positive ssRNA strand / conservative 
B) only the positive ssRNA strand / semiconservative 
C) both RNA strands /conservative 
D) both RNA strands / semiconservative 
A) only the positive ssRNA strand / conservative 
B) only the positive ssRNA strand / semiconservative 
C) both RNA strands /conservative 
D) both RNA strands / semiconservative

Question 9

Based on its function,which type(s)of viruses likely contain(s)a gene encoding for RNA replicase?

Accepted Answer

A) dsDNA and ssDNA viruses 
B) positive ssRNA viruses 
C) positive and negative ssRNA viruses 
D) ssRNA and ssDNA viruses 
A) dsDNA and ssDNA viruses 
B) positive ssRNA viruses 
C) positive and negative ssRNA viruses 
D) ssRNA and ssDNA viruses

Question 10

Herpesviruses can cause all of the following diseases in humans EXCEPT

Accepted Answer

A) cancer. 
B) chicken pox. 
C) cold sores. 
D) spongiform encephalopathy. 
A) cancer. 
B) chicken pox. 
C) cold sores. 
D) spongiform encephalopathy.

Question 11

To date,no virus that infects Archaea is known to have an RNA genome.

Accepted Answer

A) True 
 B)False

Question 12

Most known plant viruses have ________-strand RNA genomes,because small genomes ________.

Accepted Answer

A) negative / facilitate cell-to-cell transfer 
B) positive / facilitate cell-to-cell transfer 
C) negative / interact more readily with host DNA 
D) positive / interact more readily with host DNA 
A) negative / facilitate cell-to-cell transfer 
B) positive / facilitate cell-to-cell transfer 
C) negative / interact more readily with host DNA 
D) positive / interact more readily with host DNA

Question 13

What is unusual about phage MS2 infection of Escherichia coli?

Accepted Answer

A) All proteins are synthesized simultaneously during infection so there are no early and late proteins. 
B) It attaches to the host's pilus rather than the cell's surface. 
C) It enters through a host cell porin. 
D) More than one MS2 phage can be present in an individual E.coli cell. 
A) All proteins are synthesized simultaneously during infection so there are no early and late proteins. 
B) It attaches to the host's pilus rather than the cell's surface. 
C) It enters through a host cell porin. 
D) More than one MS2 phage can be present in an individual E.coli cell.

Question 14

The unconventional dsDNA genome replication mechanism where no lagging strand exists is a hallmark of which group of viruses?

Accepted Answer

A) adenoviruses 
B) coronaviruses 
C) herpes viruses 
D) pox viruses 
A) adenoviruses 
B) coronaviruses 
C) herpes viruses 
D) pox viruses

Question 15

Describe how bacteriophages influence the ocean's bacterial populations and nutrient cycling.

Accepted Answer

Phages are responsible for killing up to

Question 16

Defend why the discovery of prions and viroids changes our view on what it takes to be an infectious particle.Be sure to explain the feature of each that distinguishes them from traditional viruses.

Accepted Answer

Traditionally viruses are thought of as

Question 17

How are T7 genes transcribed?

Accepted Answer

A) Host RNA polymerase is modified to recognize the T7 promoter. 
B) Host RNA polymerase directly translates the T7 genes. 
C) T7 has its own RNA polymerase,which is packaged in its capsid and injected into the host during infection to transcribe T7 genes. 
D) T7 has its own RNA polymerase,which must first be synthesized by the host. 
A) Host RNA polymerase is modified to recognize the T7 promoter. 
B) Host RNA polymerase directly translates the T7 genes. 
C) T7 has its own RNA polymerase,which is packaged in its capsid and injected into the host during infection to transcribe T7 genes. 
D) T7 has its own RNA polymerase,which must first be synthesized by the host.

Question 18

In designing a drug to inhibit pox viruses,the compound should localize in the host's ________ to be MOST effective.

Accepted Answer

A) nucleus 
B) endoplasmic reticulum 
C) cytoplasm 
D) Golgi complex 
A) nucleus 
B) endoplasmic reticulum 
C) cytoplasm 
D) Golgi complex

Question 19

Reoviruses contain ________ genomes,and their replication occurs within the host's ________.

Accepted Answer

A) ssDNA / nucleus 
B) dsDNA / nucleus 
C) ssRNA / cytoplasm 
D) dsRNA / cytoplasm 
A) ssDNA / nucleus 
B) dsDNA / nucleus 
C) ssRNA / cytoplasm 
D) dsRNA / cytoplasm

Question 20

In contrast to positive ssRNA viruses such as coronaviruses and polioviruses,the genome of retroviruses

Accepted Answer

A) lacks genes encoding for tRNA primers. 
B) must first integrate into the host's genome before transcription. 
C) is negative ssRNA. 
D) lacks ribonuclease activity. 
A) lacks genes encoding for tRNA primers. 
B) must first integrate into the host's genome before transcription. 
C) is negative ssRNA. 
D) lacks ribonuclease activity.

Exam 9: Viral Genomes and Diversity

A bacteriophage that lacks its proteinaceous capsid structure is also called a viroid.

The filamentous DNA phages are unusual,because they

Blocking polyomavirus SV40's ability to integrate its genome into host cells would

Bacteriophage that have single-stranded genomes are specialized to minimize energy requirements because just one strand is necessary for replication.

The phage Mu

Many human-infecting viruses that illicit a strong immune response cause additional harmful effects on humans,so the discovery of a virus that can induce an immune response but not cause harm made it attractive for vaccine development.

Viruses that contain positive-strand genomes are incompatible to share genetic elements other positive-strand genomes.

The family of reoviruses contain dsRNA genomes that replicate from the template of ________ which makes it a ________ replication process.

Based on its function,which type(s)of viruses likely contain(s)a gene encoding for RNA replicase?

Herpesviruses can cause all of the following diseases in humans EXCEPT

To date,no virus that infects Archaea is known to have an RNA genome.

Most known plant viruses have ________-strand RNA genomes,because small genomes ________.

What is unusual about phage MS2 infection of Escherichia coli?

The unconventional dsDNA genome replication mechanism where no lagging strand exists is a hallmark of which group of viruses?

Describe how bacteriophages influence the ocean's bacterial populations and nutrient cycling.

Defend why the discovery of prions and viroids changes our view on what it takes to be an infectious particle.Be sure to explain the feature of each that distinguishes them from traditional viruses.

How are T7 genes transcribed?

In designing a drug to inhibit pox viruses,the compound should localize in the host's ________ to be MOST effective.

Reoviruses contain ________ genomes,and their replication occurs within the host's ________.

In contrast to positive ssRNA viruses such as coronaviruses and polioviruses,the genome of retroviruses

Microorganisms and Microbiology

Microbial Cell Structure and Function

Microbial Metabolism

Molecular Biology

Microbial Growth and Control

Microbial Genomics

Metabolic Regulation

Viruses and Virology

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

The family of reoviruses contain dsRNA genomes that replicate from the template of which makes it a replication process.

Most known plant viruses have -strand RNA genomes,because small genomes .

Reoviruses contain genomes,and their replication occurs within the host's .