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    It says this in my book:

    'The methods used to get the vector into the cell depend on the type of cell and include... viral transfer- the vector is a virus; this method uses the virus's mechanism for infecting cells by inserting DNA directly'

    But
    , why do we have to insert the gene into the viral DNA and then leave the virus to inject the DNA into the bacterial cell? Why can't we use the methods to insert the gene into the virus to just directly insert it into the bacteria?
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    anyone?
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    It's really not a simple process to get DNA into a bacterial cell. It can be done through methods such as using electricity to open pores in the bacterial cell membrane and hoping the DNA enters but these are very unreliable. Viruses however are able to have relatively large DNA sequences inserted into their genome which when they infect bacterial cells, they inject into the cell as part of their life cycle. Most cells are susceptible to viral infection so it is a far more efficient method to transfer DNA.
 
 
 
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