Recombinant DNA
For gene probes to be useful they must

both (a) and (b)
None of these
be labeled in some manner to allow detection
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

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
the DNA polymerases of these bacteria are much faster than those from other organisms
All of these

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Recombinant DNA
Bacterial cells protect their own DNA from degradation by restriction endonucleases by

deleting all recognition sites from the genome
having anti restriction endonucleases
methylating the DNA at the sites that the enzyme recognizes
not producing any restriction endonucleases

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