Recombinant DNA
For gene probes to be useful they must

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

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

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

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Recombinant DNA
The Southern blotting technique depends on

similarities between the sequences of probe DNA and experimental DNA
similarities between the sequences of probe protein and experimental protein
similarities between the sequences of probe RNA and experimental RNA
the molecular mass of proteins

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