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 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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Recombinant DNA
The Southern blotting technique depends on

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

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

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