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Restriction enzymes that are used in the...

Restriction enzymes that are used in the construction of recombinant DNA are endonucleases which cut the DNA at specific recognition sequence? What would be the disadvantage if they do not cut the DNA at specific recogniion sequence?

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It will start cutting the DNA at non-specific random sites. DNA fragments thus obtained will not bear sticky ends. Due to this recombinant DNA will not be formed.
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