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Answer Posted / forbiteh
first exonuclease is a type of DNA polymerase mostly it
helps in proofing reading by cutting phosphodiester bonds
at the end of the strand in the case of a mismatched pair.
endonuleases are mosty produced by bacteria mostly for
defense mechansism againsit foreign dna e.g that of a virus
and they cut phosphodiester bonds within the dna strand at
point called restriction sites.
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