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16 Cards in this Set
- Front
- Back
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What is a virus? |
Small acellular microbes that reproduce by assembly inside a host cell |
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What is the structure of a virus |
All- nucliec acid and a protien capsid Some- lipid envelope (animal viruses) Tail fibers (bacerial viruses) Enzymes (retroviruses) |
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What virus shape does a helical capisd have? |
Rod shaped |
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What type of shape does a icosahedral capsid have? |
20 sided (animal viruses) |
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What is a envelope? |
Lipid menbrane derived from the membranes of a host cell that contains virus surface membranes |
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What is the life cycle of a virus? |
Attachment Penetration Uncoating Replication Assembly Release |
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What happens in attachment phase? |
Specific protiens on virus cell recognize specific protiens on a host cell and attach |
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Penetration |
The entry of the virus into a host cell |
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Uncoating |
Virus capsid removed and the nucliec acid is released. |
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Replication |
Virus protiens take over cell machinery and the virus genome is replicated and virus protiens are made |
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Assembly |
Parts of the virus are put together |
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Release |
Virus leaves cell by budding or lysis |
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What happens when the virus is released by budding? |
Virus leaves cells without killing it |
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What happens when the virus is released by lysis? |
The virus destroys the cell ro leave |
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Lytic cycle |
Virus enters host cell and bursts it upon release |
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Lysogenic cycle |
Virus enters the host cell and integrates virus genes into the host cell DNA. Everytime the host cell divides, the virus is copied. |
