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chapter: 19 viruses (capsids and envelopes (some viruses have accessory…
chapter: 19 viruses
capsids and envelopes
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a capsid can have a variety of structures; associated viruses may be referred to as helical or icosahedral viruses
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a capsid is a protein shell that encloses the viral genome. they are built from protein subunits called capsomeres
viral genomes
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viruses have between three and 2,000 genes in their genome
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virus
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viruses exist in a shady area between life-forms and chemicals,leading a kind of "borrowed life"
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