Recombinant DNA
For gene probes to be useful they must

be large enough to contain gene-specific sequences
None of these
both (a) and (b)
be labeled in some manner to allow detection

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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 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

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