November 21, 2008

1. Classification of viruses
Virion-single virus particle
a. Viruses have narrow host ranges
i. Implications for disease eradication
1. What traits must a disease have for it to be potentially eradicable
2. Virus structure
a. Nucleic acid (note: some viruses have RNA genomes, not DNA ones)
i. Virus genomes come in a variety of sizes
ii. Viroid: self replicating double-stranded DNA circle
b. Protein coat
i. Capsid-protein coat that covers a virus
ii. Capsomeres
iii. Virus shapes: viruses come in a limited ranges of shapes
1. Polyhedral
2. Helical
3. Complex (only in bacteriophages)
c. Enveloped viruses also have a membrane, derived from host cell membrane (note: enveloped viruses only infect eukaryotic cells)

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