Lecture18_Viruses - Viruses I. What are viruses? A....

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Viruses I. What are viruses? A. Definition: Viruses are obligate intracellular parasites • "obligate" = they cannot reproduce on their own • "intracellular" = they enter cells to replicate • "parasites" = they take over the host cell's machinery (enzymes and nutrients) to make copies of themselves and … … in the process, they usually Note: Outside of host cells, viruses do B. Are viruses alive? definitions of a living entity (thing): 1) ability to make a 2) metabolism = controlled chemical reactions required for Viruses The cell as the fundamental structural unit of life; viruses are Viruses are not II. Viral diversity A. Genetic material In all organisms, the genetic material consists of paired strands of deoxyribonucleic acid (DNA) = "double-stranded DNA" Viral genomes may be: • double-stranded DNA • single-stranded DNA • double-stranded ribonucleic acid (RNA) • single-stranded RNA … and other variations B. Morphological diversity in viruses NOTE: viruses are TINY … typically
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This note was uploaded on 04/10/2008 for the course BIOL 180 taught by Professor Freeman during the Fall '07 term at University of Washington.

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Lecture18_Viruses - Viruses I. What are viruses? A....

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