Recombinant DNA
For gene probes to be useful they must

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

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

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

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