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a. Mention the difference in the mode of action of exonuclease and endonuclease.

b. How does restriction endonuclease function?

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a. Exonuclease removes nucleotides from the ends of DNA whereas endonuclease cuts at specific positions within DNA at specific positions.

b. Restriction endonuclease recognises and cuts specific palindromic nucleotide sequences in the DNA.

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