Recombinant DNA
For gene probes to be useful they must

be labeled in some manner to allow detection
be large enough to contain gene-specific sequences
both (a) and (b)
None 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
not producing any restriction endonucleases
methylating the DNA at the sites that the enzyme recognizes
having anti restriction endonucleases

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Recombinant DNA
A genomic library is

a collection of many clones possessing different DNA fragments from the same organisms bound to vectors
a book that describes how to isolate DNA from a particular organism
a database where the sequence of an organism's genome is stored
a place where the information of the genetic organization of organisms are kept.

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