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State the role of alkaline phosphatase i...

State the role of alkaline phosphatase in r - DNA technolgy.

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Alkaline phosphate is a DNA modifying enzyme which add or removd specific phosphate group at 5. of dsDNA or ssDNA and thus prevents self - ligation. It is purified from bacteria and calf intestine.
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Match the following {:( "Column-I", " Column-II") , (" 1. Exonuclease " , "A add or remove phosphate"),(" 2. Endonuclease" , "B. Binding the DNA fragments") , ( "3. Alkaline Phosphatase" , " C. Cut the DNA at terminus "), ("4. Ligase", "D. cut the DNA at middle"):}