Viruses; classification

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  • Viruses
    • DNA Virus
      • Lambda Phage
        • DNA acts as a template for new DNA and mRNA to make viral proteins
        • Type of bacteriophage which infects bacteria such as E. coli
    • RNA Virus
      • Tobacco Mosaic Virus
        • Makes new RNA, no DNA is made
        • An example of a ssRNA (single stranded)
        • Also known as a positive sense virus because it can be translated directly at the ribosome
      • Ebola
        • Makes new RNA, no DNA is made.
        • Ebola is a negative sense sRNA. Meaning the RNA will need to be transcribed before it can be translated
    • RetroVirus
      • HIV
        • They contain RNA that directs the synthesis of the enzyme Reverse Transcriptase
          • The enzyme makes DNA versions of the RNA genome
        • The DNA is incorporated into the host cell and used to make more viral proteins and RNA genomes
          • The enzyme makes DNA versions of the RNA genome

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