Question 1

Most viruses that infect plants have the following type of genome?

Accepted Answer

A) ssDNA,positive sense 
B) ssDNA,negative sense 
C) ssRNA,positive sense 
D) ssRNA,negative sense 
E) None of the above. 
A) ssDNA,positive sense 
B) ssDNA,negative sense 
C) ssRNA,positive sense 
D) ssRNA,negative sense 
E) None of the above. C

Question 2

According to the RNA World hypothesis,which of the following enzymes may have evolved first?

Accepted Answer

A) DNA-dependent RNA polymerase 
B) DNA-dependent DNA polymerase 
C) RNA-dependent RNA polymerase 
D) RNA-dependent DNA polymerase 
E) self-replicating RNAs 
A) DNA-dependent RNA polymerase 
B) DNA-dependent DNA polymerase 
C) RNA-dependent RNA polymerase 
D) RNA-dependent DNA polymerase 
E) self-replicating RNAs E

Question 3

Which of the following types of genomes is most commonly found in viruses that can infect fungi?

Accepted Answer

A) ssDNA 
B) dsDNA 
C) ssRNA 
D) dsRNA 
E) All of the above are found. 
A) ssDNA 
B) dsDNA 
C) ssRNA 
D) dsRNA 
E) All of the above are found. D

Question 4

An interesting observation is that many highly pathogenic and deadly human viruses have the following type of genome?

Accepted Answer

A) ssDNA,positive sense 
B) ssDNA,negative sense 
C) ssRNA,positive sense 
D) ssRNA,negative sense 
E) dsRNA 
A) ssDNA,positive sense 
B) ssDNA,negative sense 
C) ssRNA,positive sense 
D) ssRNA,negative sense 
E) dsRNA

Question 5

What is a possible explanation for why ssDNA viruses have genomes less that 10kb in size?

Accepted Answer

A) ssDNA is not as physically stable as dsDNA. 
B) ssDNA is not transcribed by host cells. 
C) ssDNA can form hairpin structures because of base-pairing. 
D) Larger pieces of ssDNA can not be replicated. 
E) Larger pieces of ssDNA can not easily enter the host cell. 
A) ssDNA is not as physically stable as dsDNA. 
B) ssDNA is not transcribed by host cells. 
C) ssDNA can form hairpin structures because of base-pairing. 
D) Larger pieces of ssDNA can not be replicated. 
E) Larger pieces of ssDNA can not easily enter the host cell.

Question 6

What is approximately the largest size of a double-stranded DNA genome of a virus that infect vertebrates?

Accepted Answer

A) 25 kbp. 
B) 50 kbp 
C) 100 kbp 
D) 300 kbp 
E) 500 kbp 
A) 25 kbp. 
B) 50 kbp 
C) 100 kbp 
D) 300 kbp 
E) 500 kbp

Question 7

Why is the type of disease caused not the best criteria to use when classifying a virus?

Accepted Answer

The disease caused by a specific virus i

Question 8

Which of the following characteristics are NOT one of the most important criterion used to classify viruses into families?

Accepted Answer

A) topology of genome (linear or circular) 
B) strandedness of genome (double or single stranded) 
C) type of nucleic acid used in genome (DNA or RN
A)  
D) structure of virion 
E) species of host infected 
A) topology of genome (linear or circular) 
B) strandedness of genome (double or single stranded) 
C) type of nucleic acid used in genome (DNA or RN
A)  
D) structure of virion 
E) species of host infected

Question 9

Retroviruses are the only virus family known to package two copies of its genome.

Accepted Answer

A) True 
 B)False

Question 10

According to the RNA World hypothesis,which of the following subcellular entities may have evolved first?

Accepted Answer

A) Retroviruses 
B) RNA Viruses 
C) Viroids 
D) DNA Viruses 
E) Bacteriophages 
A) Retroviruses 
B) RNA Viruses 
C) Viroids 
D) DNA Viruses 
E) Bacteriophages

Question 11

What distinguishes a satellite virus from a satellite nucleic acid?

Accepted Answer

A) A satellite virus encodes its own capsid protein while a satellite nucleic acid does not. 
B) A satellite virus packages its own replication protein while a satellite nucleic acid does not. 
C) A satellite virus requires a helper virus while a satellite nucleic acid does not. 
D) Genomes of satellite viruses are smaller than those of satellite nucleic acids. 
E) Satellite viruses do not encode any proteins while satellite nucleic acids do. 
A) A satellite virus encodes its own capsid protein while a satellite nucleic acid does not. 
B) A satellite virus packages its own replication protein while a satellite nucleic acid does not. 
C) A satellite virus requires a helper virus while a satellite nucleic acid does not. 
D) Genomes of satellite viruses are smaller than those of satellite nucleic acids. 
E) Satellite viruses do not encode any proteins while satellite nucleic acids do.

Question 12

Viroids do not require a helper virus in order to replicate and cause disease.

Accepted Answer

A) True 
 B)False

Question 13

Mimivirus,which infects an amoeba,is the largest known dsDNA virus and has a genome larger than some free living bacteria and archae.Even though it encodes many of its own enzymes and even tRNAs,it still does not produce its own ribosomes.Describe the possible evolutionary origin of such a large and complex viruses.

Accepted Answer

Mimiviruses,along with poxviruses,are th

Question 14

The name of a virus family in the Latin classification system has which of the following endings?

Accepted Answer

A) -viridae 
B) -virales 
C) -virinae 
D) -virus 
E) -virusdae 
A) -viridae 
B) -virales 
C) -virinae 
D) -virus 
E) -virusdae

Question 15

Almost all of the viruses with positive-strand RNA genomes and enveloped virions infect which group of hosts?

Accepted Answer

A) Bacteria. 
B) Vertebrates 
C) Plants 
D) Fungi 
E) Algae. 
A) Bacteria. 
B) Vertebrates 
C) Plants 
D) Fungi 
E) Algae.

Question 16

Which of the following is a type of nucleic acid NOT found as the genome of a virus that can infect vertebrates?

Accepted Answer

A) ssDNA 
B) dsDNA 
C) ssRNA 
D) dsRNA 
E) All of the above are found. 
A) ssDNA 
B) dsDNA 
C) ssRNA 
D) dsRNA 
E) All of the above are found.

Question 17

There are several types of viruses with enveloped virions that can infect plants.

Accepted Answer

A) True 
 B)False

Question 18

What is a ribozyme?

Accepted Answer

A) A molecule of RNA that is independently capable of replicating without cellular enzymes. 
B) A molecule of RNA that codes for an enzyme. 
C) Another name for a small infectious molecule of RNA 
D) A virus that uses a small piece of RNA as its genome. 
E) A molecule of RNA that can carry out an enzymatic process. 
A) A molecule of RNA that is independently capable of replicating without cellular enzymes. 
B) A molecule of RNA that codes for an enzyme. 
C) Another name for a small infectious molecule of RNA 
D) A virus that uses a small piece of RNA as its genome. 
E) A molecule of RNA that can carry out an enzymatic process.

Question 19

The advantage of using a helical instead of an icosahedral nucleocapsid to package a ssRNA genome is…..

Accepted Answer

A) it is more efficient to envelope a helical nucleocapsid than an icosahedral capsid. 
B) it is easier to produce a helical nucleocapsid than an icosahedral capsid. 
C) it better protects the genome from degradation inside the cell. 
D) it requires a smaller protein to build than an icosahedral capsid. 
E) it requires fewer copies of the nucleocapsid protein than an icosahedral capsid. 
A) it is more efficient to envelope a helical nucleocapsid than an icosahedral capsid. 
B) it is easier to produce a helical nucleocapsid than an icosahedral capsid. 
C) it better protects the genome from degradation inside the cell. 
D) it requires a smaller protein to build than an icosahedral capsid. 
E) it requires fewer copies of the nucleocapsid protein than an icosahedral capsid.

Question 20

Which of the following virus families have the ability to synthesize reverse transcriptase?

Accepted Answer

A) Retroviruses 
B) Caulimoviruses 
C) Hepadnaviruses 
D) None of the above are correct. 
E) All of the above are correct. 
A) Retroviruses 
B) Caulimoviruses 
C) Hepadnaviruses 
D) None of the above are correct. 
E) All of the above are correct.

Exam 3: Virus Classification: the World of Viruses

Most viruses that infect plants have the following type of genome?

According to the RNA World hypothesis,which of the following enzymes may have evolved first?

Which of the following types of genomes is most commonly found in viruses that can infect fungi?

An interesting observation is that many highly pathogenic and deadly human viruses have the following type of genome?

What is a possible explanation for why ssDNA viruses have genomes less that 10kb in size?

What is approximately the largest size of a double-stranded DNA genome of a virus that infect vertebrates?

Why is the type of disease caused not the best criteria to use when classifying a virus?

Which of the following characteristics are NOT one of the most important criterion used to classify viruses into families?

Retroviruses are the only virus family known to package two copies of its genome.

According to the RNA World hypothesis,which of the following subcellular entities may have evolved first?

What distinguishes a satellite virus from a satellite nucleic acid?

Viroids do not require a helper virus in order to replicate and cause disease.

The name of a virus family in the Latin classification system has which of the following endings?

Almost all of the viruses with positive-strand RNA genomes and enveloped virions infect which group of hosts?

Which of the following is a type of nucleic acid NOT found as the genome of a virus that can infect vertebrates?

There are several types of viruses with enveloped virions that can infect plants.

What is a ribozyme?

The advantage of using a helical instead of an icosahedral nucleocapsid to package a ssRNA genome is…..

Which of the following virus families have the ability to synthesize reverse transcriptase?

Introduction to Virology 2

Virus Structure and Assembly

Virus Entry

Single-Stranded Rna Bacteriophages

Microviruses

Bacteriophage

Bacteriophage Lambda

Viruses of Archaea

Cucumber Mosaic Virus

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