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2012-05-22 15:59:02

final exam
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  1. obligate inracellular parasite
    requiree a living host cell in order to muliply
  2. viruses are non living becuase
    they cant reproduce on their own
  3. viruses contain
    either DNA or RNA covered by a protien coat
  4. viruses muliply
    inside living cells by using the synthesizing metabolic machinery of a cell to transfer the viral nucleic acid to other cells
  5. host range
    range of cells/tissues viruses can infect
  6. host range dertermined
    • by a receptor found on the cell surface
    • viruses can only infect a specific type of tissue within a host cell
  7. viral size determined
    • by electron microscopy. 20 to 100nm
    • cannot be seen under a microscope.
  8. interferon
    • antiviral protien
    • alpha, beta, gamma
  9. inferons produced by
    • a virus infected cell and migrate to uninfecceted cells taht then produce antivral protiens
    • host cell specific
  10. phage replication
    • attachment
    • penetration
    • biosynthesis
    • maturation
    • release
  11. attachment
    bateriophage attaches to cell wall
  12. penetration
    phage makes opening in cell and injects DNA
  13. biosynthesis
    phage DNA directs synthesis of viral protien and nucleic acid
  14. maturation
    viral compnents are assembed into virons
  15. release
    host cell dies and virions are released into surrounding medium
  16. lysogeny
    • instead of biosynthesis maturation and relase
    • nucleic acid is integrated into genome becomeing a prophage
  17. prophage
    inserted phage DNA O
  18. anamil virus replication
    • attachment- uses receptors on cell sufaces often using spikes on a virus
    • penetration- whole virus enerts cell via endocytosis
    • uncoating- virus capsid is removed
    • biosynthesis- transcription produce virus enzymes, viral nucleic acid, and capsid protiens
    • maturation- virus particles are assembled
    • release- virus particles are exposed
  19. biosynthesis of RNA viruses
    • produce reverse transcriptase to make cDNA
    • dna then directs synethesis of viral components
    • attachment
    • entry and uncoating
    • RNA replication by RNA polymerase
    • translation and synthesis of viral protiens
    • maturation and release
  20. cancer causing viruses
    • first identified in chickens
    • genes derviced originally from host
    • cancer causing process- transformation