Recombinant DNA
Enzymes that recognize and cleave specific 4 to 8 base pair sequences of DNA are

restriction endonucleases
DNA gyrase
helicases
DNA ligase

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Recombinant DNA
Bacterial cells protect their own DNA from degradation by restriction endonucleases by

not producing any restriction endonucleases
methylating the DNA at the sites that the enzyme recognizes
deleting all recognition sites from the genome
having anti restriction endonucleases

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