Question 1

Which of the following describes the hypersensitive response in plants infected with the cucumber mosaic virus?

Accepted Answer

A) The virus moves into the vascular tissue and causes a systemic infection. 
B) The virus causes an asymptomatic infection. 
C) Virus replication is limited to a local region of infection. 
D) The plant is completely resistant to the virus. 
E) Virus replication only occurs in the newest tissues on the plant. 
A) The virus moves into the vascular tissue and causes a systemic infection. 
B) The virus causes an asymptomatic infection. 
C) Virus replication is limited to a local region of infection. 
D) The plant is completely resistant to the virus. 
E) Virus replication only occurs in the newest tissues on the plant. C

Question 2

The methyltransferase domain of the polymerase subunit 1a in the cucumber mosaic virus is responsible for doing with of the following?

Accepted Answer

A) Separating strands of the viral RNA during replication. 
B) Replicating the viral genome. 
C) Adding the 5' cap to the viral RNA genome segments. 
D) Movement of the viral genome through the plasmodesmata. 
E) Inhibiting host ribonucleases. 
A) Separating strands of the viral RNA during replication. 
B) Replicating the viral genome. 
C) Adding the 5' cap to the viral RNA genome segments. 
D) Movement of the viral genome through the plasmodesmata. 
E) Inhibiting host ribonucleases. C

Question 3

Describe how satellite RNAs of the cucumber mosaic virus are act as parasites of the virus.

Accepted Answer

Satellite RNAs are small linear RNAs that do not appear to encode any functional proteins.These RNAs are dependent on cucumber mosaic virus for their replication and transmission.They are packaged into the capsids of the cucumber mosaic virus.The presence of these RNAs usually reduces the accumulation of cucumber mosaic virus particles in infected cells,which leads to a reduction of symptoms in a plant infected with both cucumber mosaic virus and the satellite RNA.Since the satellite RNA is dependent on the cucumber mosaic virus for its own replication and transmission and reduces the efficiency of viral replication,then it is acting as "a parasite of the virus".

Question 4

Plants infected with cucumber mosaic virus are more tolerant to drought and cold than uninfected plants.

Accepted Answer

A) True 
 B)False

Question 5

What is the role of the plasmodesmata in the replication of cucumber mosaic virus?

Accepted Answer

A) They allow release of progeny virions from host cells. 
B) They are the sites of entry of capsids into the host cell. 
C) They are the sites of viral replication inside of plant cells. 
D) They allow movement of virus genomes between neighboring cells. 
E) They are involved in assembly of progeny virions. 
A) They allow release of progeny virions from host cells. 
B) They are the sites of entry of capsids into the host cell. 
C) They are the sites of viral replication inside of plant cells. 
D) They allow movement of virus genomes between neighboring cells. 
E) They are involved in assembly of progeny virions.

Question 6

Which of the following proteins from cucumber mosaic virus acts at the RNA-dependent RNA polymerase?

Accepted Answer

A) Protein 1a 
B) Protein 2a 
C) Protein 2b 
D) Movement Protein 
E) Coat Protein 
A) Protein 1a 
B) Protein 2a 
C) Protein 2b 
D) Movement Protein 
E) Coat Protein

Question 7

In an infected plants,the cucumber mosaic virus replicase complex is associated with the membrane surrounding which of the following cellular organelles?

Accepted Answer

A) Golgi apparatus 
B) Nucleus 
C) Mitochondria 
D) Central Vacuole 
E) Chloroplast 
A) Golgi apparatus 
B) Nucleus 
C) Mitochondria 
D) Central Vacuole 
E) Chloroplast

Question 8

Viruses that infect plants must contend with the thick cell wall,which is impedes movement of macromolecules between cells.Describe the mechanisms that cucumber mosaic virus uses to transverse this cell wall to both initiate an infection as well as spread through the plant.

Accepted Answer

Cucumber mosaic virus is transmitted to

Question 9

Most cultivars of cucumber are resistant to the cucumber mosaic virus,which means they can be infected but do not show any symptoms of the infection.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following describes the structures of the genomic RNA segments from cucumber mosaic virus?

Accepted Answer

A) They have a 5' cap and a 3' poly A tail. 
B) They have a 5' IRES and a 3' poly A tail. 
C) They have a 5' cap and a 3' terminal tRNA-like structure. 
D) They have a 5' phosphate and a 3' terminal tRNA-like structure. 
E) They have a protein covalently bound to the 5' end and a 3' poly A tail. 
A) They have a 5' cap and a 3' poly A tail. 
B) They have a 5' IRES and a 3' poly A tail. 
C) They have a 5' cap and a 3' terminal tRNA-like structure. 
D) They have a 5' phosphate and a 3' terminal tRNA-like structure. 
E) They have a protein covalently bound to the 5' end and a 3' poly A tail.

Question 11

All of the following describe a function of the movement protein from cucumber mosaic virus EXCEPT:

Accepted Answer

A) It allows the viral RNA to move between host cells. 
B) It interacts with the host cytoskeleton. 
C) It dilates the plasmodesmata. 
D) It binds to viral genomic RNAs. 
E) It causes the viral RNA to be taken up by aphids. 
A) It allows the viral RNA to move between host cells. 
B) It interacts with the host cytoskeleton. 
C) It dilates the plasmodesmata. 
D) It binds to viral genomic RNAs. 
E) It causes the viral RNA to be taken up by aphids.

Question 12

Which of the following characteristics of the cucumber mosaic virus influences the aphid species that can transmit the virus?

Accepted Answer

A) Amino acid sequence of the coat protein. 
B) The replication efficiency of the RNA-dependent RNA polymerase. 
C) The specificity of binding to the host cell receptor. 
D) The sequence of the 3' end of the viral genomic RNA. 
E) The sequence of the IRES at the 5' end of the genomic RNA. 
A) Amino acid sequence of the coat protein. 
B) The replication efficiency of the RNA-dependent RNA polymerase. 
C) The specificity of binding to the host cell receptor. 
D) The sequence of the 3' end of the viral genomic RNA. 
E) The sequence of the IRES at the 5' end of the genomic RNA.

Question 13

Which of the following describes a feature of plant viruses,like cucumber mosaic virus,that is rare or absent in animal viruses?

Accepted Answer

A) Segmented genomes are each packaged into a single virion. 
B) Viral particles are transmitted to new hosts via an insect vector. 
C) Viral genomes are composed of ssRNA with a negative sense. 
D) Viral genomic RNA has a 5' cap. 
E) Segmented genomes are each packaged into separate virions. 
A) Segmented genomes are each packaged into a single virion. 
B) Viral particles are transmitted to new hosts via an insect vector. 
C) Viral genomes are composed of ssRNA with a negative sense. 
D) Viral genomic RNA has a 5' cap. 
E) Segmented genomes are each packaged into separate virions.

Question 14

Which of the following describes the first step in the replication cycle of the cucumber mosaic virus?

Accepted Answer

A) Synthesis of minus-strand copies of the genome. 
B) Synthesis of plus-strand copies of the genome. 
C) Copying of viral genome into dsDNA. 
D) Copying of the viral genome into mRNA. 
E) Translation of the genome into protein. 
A) Synthesis of minus-strand copies of the genome. 
B) Synthesis of plus-strand copies of the genome. 
C) Copying of viral genome into dsDNA. 
D) Copying of the viral genome into mRNA. 
E) Translation of the genome into protein.

Question 15

How has reassortment played a role in the evolution of cucumber mosaic virus?

Accepted Answer

A) It has allowed swapping of RNA segments between strains. 
B) It has allowed swapping of regions of the genome between strains 
C) It has increased mutations in the RNA genomes. 
D) It has maintained stability of the viral genome. 
E) It has increased genetic bottlenecks. 
A) It has allowed swapping of RNA segments between strains. 
B) It has allowed swapping of regions of the genome between strains 
C) It has increased mutations in the RNA genomes. 
D) It has maintained stability of the viral genome. 
E) It has increased genetic bottlenecks.

Question 16

In lieu of an immune response,plants use RNA silencing to defend against virus infection.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following statements about satellite RNAs found in cucumber mosaic virus infections is FALSE?

Accepted Answer

A) They require a cucumber mosaic virus for replication. 
B) They are packaged into cucumber mosaic virus capsids. 
C) They are small linear RNA molecules. 
D) They encode several functional proteins. 
E) They can increase the symptoms produced by cucumber mosaic virus. 
A) They require a cucumber mosaic virus for replication. 
B) They are packaged into cucumber mosaic virus capsids. 
C) They are small linear RNA molecules. 
D) They encode several functional proteins. 
E) They can increase the symptoms produced by cucumber mosaic virus.

Question 18

Which of the following statements about cucumber mosaic virus is FALSE?

Accepted Answer

A) It has an enveloped helical nucleocapsid. 
B) It has a wide range of host species that it can infect. 
C) Its genome is composed of positive-strand RNA. 
D) It is transmitted by aphids. 
E) It can cause asymptomatic infections in some plants. 
A) It has an enveloped helical nucleocapsid. 
B) It has a wide range of host species that it can infect. 
C) Its genome is composed of positive-strand RNA. 
D) It is transmitted by aphids. 
E) It can cause asymptomatic infections in some plants.

Question 19

Plant defenses against RNA viruses involved which of the following?

Accepted Answer

A) siRNAs 
B) RISC 
C) Dicer 
D) Host RNA-dependent RNA polymerase 
E) All of the above are correct. 
A) siRNAs 
B) RISC 
C) Dicer 
D) Host RNA-dependent RNA polymerase 
E) All of the above are correct.

Question 20

Which of the following has been used as a system to study brome mosaic virus replication?

Accepted Answer

A) Bacterial cells 
B) Yeast cells 
C) Insect cells 
D) Animal cells 
E) Human cells 
A) Bacterial cells 
B) Yeast cells 
C) Insect cells 
D) Animal cells 
E) Human cells

Exam 10: Cucumber Mosaic Virus

Which of the following describes the hypersensitive response in plants infected with the cucumber mosaic virus?

The methyltransferase domain of the polymerase subunit 1a in the cucumber mosaic virus is responsible for doing with of the following?

Describe how satellite RNAs of the cucumber mosaic virus are act as parasites of the virus.

Plants infected with cucumber mosaic virus are more tolerant to drought and cold than uninfected plants.

What is the role of the plasmodesmata in the replication of cucumber mosaic virus?

Which of the following proteins from cucumber mosaic virus acts at the RNA-dependent RNA polymerase?

In an infected plants,the cucumber mosaic virus replicase complex is associated with the membrane surrounding which of the following cellular organelles?

Viruses that infect plants must contend with the thick cell wall,which is impedes movement of macromolecules between cells.Describe the mechanisms that cucumber mosaic virus uses to transverse this cell wall to both initiate an infection as well as spread through the plant.

Most cultivars of cucumber are resistant to the cucumber mosaic virus,which means they can be infected but do not show any symptoms of the infection.

Which of the following describes the structures of the genomic RNA segments from cucumber mosaic virus?

All of the following describe a function of the movement protein from cucumber mosaic virus EXCEPT:

Which of the following characteristics of the cucumber mosaic virus influences the aphid species that can transmit the virus?

Which of the following describes a feature of plant viruses,like cucumber mosaic virus,that is rare or absent in animal viruses?

Which of the following describes the first step in the replication cycle of the cucumber mosaic virus?

How has reassortment played a role in the evolution of cucumber mosaic virus?

In lieu of an immune response,plants use RNA silencing to defend against virus infection.

Which of the following statements about satellite RNAs found in cucumber mosaic virus infections is FALSE?

Which of the following statements about cucumber mosaic virus is FALSE?

Plant defenses against RNA viruses involved which of the following?

Which of the following has been used as a system to study brome mosaic virus replication?

Introduction to Virology 2

Virus Structure and Assembly

Virus Classification: the World of Viruses

Virus Entry

Single-Stranded Rna Bacteriophages

Microviruses

Bacteriophage

Bacteriophage Lambda

Viruses of Archaea

Picornaviruses

Flaviviruses

Togaviruses

Coronaviruses

Paramyxoviruses and Rhabdoviruses

Filovirouses

Bunyaviruses

Influenza Viruses

Reoviruses

Parvoviruses

Polyomaviruses

Papillomaviruses

Adenoviruses

Herpesviruses

Baculoviruses

Poxviruses

Viruses of Algae and Mimivirus

Retroviruses

Human Immunodeficiency Virus

Hepadnaviruses

Viroids and Hepatitis Delta Virus

Prions

Intrinsic Cellular Defenses Against Virus Infection

Innate and Adaptive Immune Responses to Virus Infection

Antiviral Vaccines

Antiviral Chemotherapy

Eukaryotic Virus Vectors

Filters