Recombinant DNA
For gene probes to be useful they must

both (a) and (b)
None of these
be large enough to contain gene-specific sequences
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

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

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