OIA1010 VIROLOGY

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30 Terms

1
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What are viruses composed of?

A nucleic acid (DNA or RNA) and a protein coat, sometimes enclosed by an envelope.

2
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What is a virion?

A complete, infectious viral particle with nucleic acid surrounded by a protein coat.

3
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Define host range.

The spectrum of host cells a virus can infect.

4
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What are capsomeres?

Protein subunits that make up the capsid of a virus.

5
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What is the size range of viruses?

20 to 1000 nanometers.

6
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How are helical viruses structured?

They have a cylindrical capsid with nucleic acid inside a helical structure.

7
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Name an example of a polyhedral virus.

Poliovirus (icosahedron-shaped).

8
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What distinguishes enveloped viruses?

They have a lipid envelope; e.g., influenza virus (enveloped helical).

9
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What is a complex virus?

A virus with multiple layers or components, like bacteriophages and poxviruses.

10
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What are viral spikes?

Protein projections on an envelope used for attachment to host cells.

11
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How are viruses named in taxonomy?

Family names end in -viridae, genus names in -virus.

12
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Provide an example of a virus family and genus.

Family: Herpesviridae; Genus: Simplexvirus (e.g., human herpesvirus 2).

13
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Compare the lytic and lysogenic cycles of bacteriophages.

Lytic cycle ends in host cell death; lysogenic cycle integrates viral DNA into host DNA.

14
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List the five steps of the lytic cycle.

Attachment, penetration, biosynthesis, maturation, and release.

15
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What is the main difference in animal virus replication?

Includes uncoating of the virus after entry.

16
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What are the four steps of the lysogenic cycle?

Attachment, entry, integration, and cell division.

17
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What methods are used to diagnose viral infections?

Serology, microscopic identification, antigen detection, and nucleic acid detection.

18
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How is the plaque method used?

To detect and count bacteriophages on solid media.

19
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How does active immunity differ from passive immunity?

Active immunity is from vaccines; passive immunity involves transferred antibodies.

20
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Name a vaccine-preventable viral disease.

Measles, Mumps, Rubella (MMR vaccine).

21
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What is herd immunity?

Protection of the population when a high percentage is vaccinated.

22
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What virus causes rabies?

Rabies virus, a helical virus.

23
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Which virus uses CD4+ T lymphocytes as a host?

Human Immunodeficiency Virus (HIV)

24
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Give an example of an enveloped polyhedral virus.

Herpes simplex virus

25
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What are prions?

Infectious proteins causing diseases like scrapie and mad cow disease

26
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Who proposed the prion hypothesis?

Stanley Prusiner

27
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Compare enveloped and non-enveloped viruses.

Enveloped viruses have a lipid layer, while non-enveloped viruses lack this layer

28
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How do DNA and RNA viruses differ?

DNA viruses replicate using host DNA machinery; RNA viruses often require reverse transcription or RNA polymerase

29
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Name a broad-host-range virus.

Rabies virus (infects rodents, dogs, and humans)

30
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What is the significance of viral spikes in influenza?

They enable the virus to attach and enter host cells.