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Viruses (Prions (Infectious proteins that appear to cause degenerative…

- - - - Capsids may have different structures
        
        Icosahedral
        
        Helical
- - - - Provirus- viral DNA integrated into host genome that remains in host cell permanently
    - - Retroviruses
        
        use reverse transcriptase to copy their RNA into DNA
  - - - Entering through damaged cell walls
    - - Inheriting the virus through parent plant
  - - - Lytic cycle
        
        Phage replication cycle that ends in the death of the host cell when the new phages rupture the host cell wall
        
        Virulent Phage - If a phage only reproduces through the lytic cycle
        
        Temperate Phages
        
        Use both lytic and Lysogenic cycles
      - Lysogenic Cycle
        
        DNA/Genome replication without destroying host cell
        
        Viral DNA is incorporated in host cells chromosome
        
        An environmental factor can trigger the virus genome to exit bacteria chromosome and switch to the lytic cycle
    - - restriction enzymes
        
        foreign DNA can be identified and cut up