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

restriction endonucleases
helicases
DNA ligase
DNA gyrase

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Recombinant DNA
A genomic library is

a book that describes how to isolate DNA from a particular organism
a place where the information of the genetic organization of organisms are kept.
a collection of many clones possessing different DNA fragments from the same organisms bound to vectors
a database where the sequence of an organism's genome is stored

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