Restriction endonucleases are found in nature. They are extremely useful for genetic engineering. Why do organisms produce them?They are involved in DNA replication in prokaryotes.Because they cut only at specific sequences in DNA, they are useful in cutting harmful DNA (such as viral DNA) without harming the organism that produces them (which can protect those sequences in its own DNA).They are part of the viral life cycle and help in the assembly of new viruses.Organisms produce them as a way of allowing new genetic material to be inserted.12

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