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Ch. 19 Viruses (Viruses (Structure of virus (Capsid (Protein shell…

- - - - Protein shell enclosing viral genome
      - capsid can be rod-shaped, polyhedral, or complex depending on virus
      - built from capsmeres
    - - Ex: viral envelopes: contain host cell philosolipids and membrane proteins
- - - - Ex: West nile virus
  - - - Ex: T-even phages use tall apparatus to inject DNA
  - - - phage replicative cycle that ends in death
      - term refers to last stage of infection where phages are released
      - each cell can then infect healthy cells
      - virulent phages only replicate in this cycle
    - - coexisting with their host cells
      - allows replication of genome without destroying host cells
      - temperate phages can do both when replicating
      - prophage: intergrated viral DNA
  - - - Bacteria and archaea protected themselves w/ this
      - clustered regularly interspaced short palindromic repeats
  - - - RNA or DNA genome
      - Presence or absence of membranous envelope
        
        If it has either or both
        
        glycoproteins on envelope bind to specific molecules
        
        derives from host cells plasma membrane
      - Viral genetic material
        
        broadest variety of RNA found in viruses that infect animals