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

genetic engineering
protein engineering
microbiology
population genetics

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Recombinant DNA
A genomic library is

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

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