Viruses - Viruses Viroids and Prions What are Viruses Among...

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Viruses, Viroids, and Prions What are Viruses? - Among simplest of biological systems - Cause disease across all domains (eukaryota, bacteria, archae) - Not placed in domains. Why? - Not cellular life! Simply genes in protein coat - lack metabolic/replication machinery - However they do replicate The Discovery of Viruses - First isolated from tobacco plant - Initial identi±cation proved dif±cult - Could not be seen by microscopes of the time. - Disease caused by biological agent - Agent contained in sap - Agent likely bacteria - Disease caused by bacterial toxin (however, toxins cannot replicate and transfer to a new plant - Disease caused by a TINY replicating agent (unusually small bacteria) - Tobacco disease needs the host to replicate - Tobacco disease was caused by: - Biological agent - Smaller than bacteria - Needed host to replicate - Called it a Virus Viral Structure
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- Helical - Capsid: outer shell of virus - Capsomer: functional unit of capsid (self assemble to form capsid) - Looks like a rod - Icosohedral
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This note was uploaded on 09/21/2011 for the course BSC 2010 taught by Professor Bowes during the Spring '08 term at University of Florida.

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Viruses - Viruses Viroids and Prions What are Viruses Among...

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