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

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

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Recombinant DNA
A genomic library is

a database where the sequence of an organism's genome is stored
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

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