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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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
not producing any restriction endonucleases
methylating the DNA at the sites that the enzyme recognizes

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Recombinant DNA
The Southern blotting technique depends on

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

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