Chapter 27 - Chapter 27 Viruses I. Nature of Viruses A....

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Chapter 27 Viruses I. Nature of Viruses A. Structure; 1. Nucleic acid core a. RNA b. DNA double stranded or single stranded 2. Protein coat (capsid) few proteins repeated many times B. Viral replication 1. Suitable host cells, most = specific 2. Uses hosts DNA and ribosome to replicate 3. Viruses lack the ability to reproduce outside the host cells C. Viral Shape 1. Helical = threadlike, mosaic viruses 2. Isometric = somewhat spherical Icosahedrons= geodesic dome, 20 triangular facets [ ˌʌɪ k ɒ s ə 'hi:dr ə n]  [a three-dimensional shape having twenty plane faces] D. Genome = varied 1- (+) Strand viruses are similar to m RNA 2- (-) Strand viruses are complimentary to m RNA 3- Single -stranded DNA 4- Double -stranded DNA
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II. Bacteriophages Viruses that attack bacteria [causes infection in bacteria] Reproductive cycles 1. Lytic cycle - kills host cells after viral replication 2. Lysogenic cycle – viral nucleic acids are incorporated into host DNA = prophage III. HIV
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Chapter 27 - Chapter 27 Viruses I. Nature of Viruses A....

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