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
The Southern blotting technique depends on

similarities between the sequences of probe DNA and experimental DNA
similarities between the sequences of probe protein and experimental protein
the molecular mass of proteins
similarities between the sequences of probe RNA and experimental RNA

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