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Unformatted text preview: Chapter 13 Viruses, Virions & Prions Virus- a non-cellular life form that is always an obligate intracellular parasite; viruses have no metabolic activity outside their host cells. Virion- a complete virus particle Structure: Capsid- a protein coat that surrounds the virus nucleic acid Envelope- an outer covering of lipid, protein A/O carbohydrates that envelops the virion Nucleic Acid- virus particles may contain either DNA or RNA in single or in double strands Each virus has unique nucleic acids Host Range- each virus requires a particular host species and a particular tissue cell to establish an infection within a particular host. Morphology: Virus particles may be classified into several morphological groups. See the table . Cultivation of Viruses Viruses require living host cells in order to multiply. Viral cultures then must be grown in sterile, cell cultures of a susceptible host, or in embryonated eggs, or in living animals or plants....
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