Recombinant DNA
The deliberate modifications of an organism's genetic information by directly changing its nucleic acid content is a subject matter of

population genetics
protein engineering
microbiology
genetic engineering

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Recombinant DNA
A genomic library is

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 collection of many clones possessing different DNA fragments from the same organisms bound to vectors
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
deleting all recognition sites from the genome
methylating the DNA at the sites that the enzyme recognizes
having anti restriction endonucleases

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