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

DNA gyrase
restriction endonucleases
DNA ligase
helicases

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Recombinant DNA
Vectors are

molecules that help in replication
molecules that protect host cells from invasion by foreign DNA
molecules that degrade nucleic acids
molecules that are able to covalently bond to and carry foreign DNA into cells

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

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

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