Recombinant DNA
Charged molecules are separated based on varying rates of migration through a solid matrix when subjected to an electric field. This technique is known as

blotting
photoreactivation
autoradiography
gel electrophoresis

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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
not producing any restriction endonucleases
having anti restriction endonucleases
deleting all recognition sites from the genome

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