Please answer this question ??

Dear student,
Please find below the answer:

The correct option is (1).
Restriction endonucleases are found in eubacteria and archaebacteria where they cut the DNA of invader molecules like viruses and prevent themselves from undergoing cleavage. Eukaryotic DNA is highly methylated and so, these enzymes are not present in it. 

Hope this information clears your doubt.
Regards.

 

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