Recombinant DNA
For gene probes to be useful they must

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

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Recombinant DNA
Vectors are

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

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