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
Vectors are

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

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Recombinant DNA
The advantage of using DNA polymerases from thermophilic organisms in PCR is that

the DNA polymerases of these bacteria never make mistakes while replicating DNA
the DNA polymerases of these bacteria can withstand the high temperatures needed to denature the DNA strands
All of these
the DNA polymerases of these bacteria are much faster than those from other organisms

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