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Viruses (Virus-an infectious particle consisting of nucleic acid…

- - - - Two ways of replicating
        
        Lytic Cycle-a replicative cycle that leads to the host cell
        
        Phages that replicate through the lytic stage are known as virulent phage
        
        Lyt=lit because it blows up
        
        Lysogenic Cycle-coexisting in the host cell replicating the phage genome without killing the cell. In most cases combines with chromosomes to make viral proteins that weaken DNA which then bonds bacterial chromosomes with circular dna molecules. known as prophage
        
        lyse=lies in side the cell
        
        Temperate Phage-phages that are capable of using both modes of replicating within a bacterium
        
        Restriction enzymes - bacterias defemse against phages by restricting phage's ability to replicate within the bacteria
        
        Viruses must create protein within the cell finessing resources in order to create viral proteins in order fpr new viruses to spread
        
        In order to do this many viruses either start as DNA genomes that create mRNA or begin as mRNA which encodes with the host cell to create resources for the disease
        
        RNA->RNA synthesis
        
        Virus structure
        
        Glycoprotein
        
        Capsid
        
        Viral envelope
        
        RNA or DNA
        
        Reverse transcriptase
        
        How viruses survive
        
        Types of viruses-
        
        Retrovirus-Viruses that contain the enzyme called reverse transcriptase that transcribes a RNA back into DNA which is the reverse of the norm.
        
        Provirus-name given tointegrated viral DNA
      - Viruses can only survive by replicating in host cells because they are unable to make proteins by themselves
        
        when the virus's genes enter the cell it transforms the dna with viral dna to degrade the host cells
    - - viruses only hurt relevant cells like the cold affecting lung cells