Viruses

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  • Created by: chloe
  • Created on: 25-04-13 14:17
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  • Viruses
    • Structure
      • has either DNA or RNA
      • protein coat (capsid)
    • smaller than bacteria
      • range in size from about 20-30 nanometres
    • host cell
      • obligate parasite: needs a host cell to multiply
      • some enter host cell
      • specific to certain host cells
      • some inject DNA into the host cell
      • can lie dormant in a host cell for years
      • takes over host cell and stops normal cell functions -> protein/ DNA synthesis
    • uses nucleotides, ATP and amino acids to multiply and make more of its own DNA and protein coats
      • uses these to build more viruses
        • all new viruses leave the cell by bursting it or by budding
    • Retrovirus
      • RNA instead of DNA
      • with the RNA there is an enzyme called reverse transcriptase
      • HIV
        • glycoprotein on the surface attached to the host cell
          • T helper
      • if DNA mutates a vaccination will not work
  • glycoprotein on the surface attached to the host cell
    • T helper

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