Viruses - V i r uses Outline Vi ruses Vi ruses Vi ruses are...

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Viruses Outline – Viruses Structure Classification Reproduction Viruses Viruses are noncellular and thus cannot be classified with cellular organisms. Infectious Virus- L. poison, named by Louis Pasteur Generally 10-400 nm in diameter. Classification is based on: Type of nucleic acid. Size and shape. Presence / absence of outer envelope. Parasitic Nature Viruses are obligate intracellular parasites (cannot reproduce outside a living cell). Can infect a wide variety of cells, but are very specific. Bacteriophages - Infect bacterial cells. Rabies – Infects mammals only. Tobacco Mosaic – Infects only plants. More Specifically:
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Tissue Specific Viruses: y infect certain blood cells Polio – Spinal nerve cells Hepatitis – Liver cells Viral specificity thought to be product of viruses being derived from the cells they infect, therefore nucleic acid of virus was once part of host’s genome.
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Viruses - V i r uses Outline Vi ruses Vi ruses Vi ruses are...

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