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How can you use PCR in the process of generating recombinant DNA. Why would we need...

How can you use PCR in the process of generating recombinant DNA. Why would we need to add a restriction enzyme site onto a fragment of interest in the process of generating recombinant DNA? Why would you benefit from adding two different enzyme sites to a given fragment?

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Answer #1

In genetic engg. PCR IS USED to amplify the target DNA. SO after PCR a good amount of target DNA is available to transform.

So during cloning or transformation target DNA is added at specified place, to creat a place and open up plasmid a restriction enzyme is required. This enzyme will break down plasmid and leave a blint or sticky end to join with amplified target DNA during transformation process.

A single Restriction enzyme would leave sticky or blunt end which may self rejoin so to prohibit such incident two restriction enzyme is used.

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