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13 Cards in this Set
- Front
- Back
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virus
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acellular obligate intracellular paracite
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virus composed of Capsid, Core and Envelope...
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nucleic acid core: DNA or RNA
w/ a protein coat sometimes an envelope (w/ glycoprotein spikes) |
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virus shapes:
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-icosahedral
-helical -complex |
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Viruses have a "Specific Host Range" and a "Typical Animal Cycle"
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Virus sits on surface of cell
1) Entry and uncoating 2) Replication 3) Transcription and manufacture of capsid proteins 4) Self-assembley of new virus particles and their exit from the cell resulting in cell death |
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Nucleic acid in core of virus
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is not described as DNA
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Envelope
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about ½ of viruses have this composed of phospholipid bilayer. Derived from the host cell's membrane. Contain a combination of viral and host cell molecules.
Spikes = glycoproteins |
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DNA and RNA
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world of viruses divided into these two categories.
dsDNA ssDNA dsRNA ssRNA |
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1)Icosahedral virus...
2)helical virus... 3) complex... |
1..has 20 triangular sides
2...nucleic acid is the middle, protein winds around it (cylinder shape) 3...icosahedral w/ helical cylinder |
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Host range
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animal viruses infect animals
polio viruses infect primates variola virus only infects human cells |
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Bacterial Disease caused by Virus
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Viral nucleic acid in DNA, prophage, can cause cancer and disease.
►Cholera and Diptheria -Caused by bacteria that has lysogenized viral DNA |
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Viroids
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circular RNA molecules that infect plants and disrupt their growth
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Prions
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infectious proteins that cause brain diseases in mammals.
Reproduce themselves ►Mad Cow Kreutzfeld Jacob Kooru |
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Prions
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propagate by converting normal proteins into the prion version
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