Recombinant DNA
A genomic library is

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
a place where the information of the genetic organization of organisms are kept.
a book that describes how to isolate DNA from a particular organism

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

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

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