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

microbiology
protein engineering
population genetics
genetic engineering

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Recombinant DNA
Vectors are

molecules that are able to covalently bond to and carry foreign DNA into cells
molecules that help in replication
molecules that degrade nucleic acids
molecules that protect host cells from invasion by foreign DNA

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