Recombinant DNA
For gene probes to be useful they must

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

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Recombinant DNA
Vectors are

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

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