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

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

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