Recombinant DNA
The Southern blotting technique depends on

similarities between the sequences of probe DNA and experimental DNA
similarities between the sequences of probe protein and experimental protein
the molecular mass of proteins
similarities between the sequences of probe RNA and experimental RNA

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Recombinant DNA
A genomic library is

a book that describes how to isolate DNA from a particular organism
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.

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