Recombinant DNA
Problems in obtaining large amounts of proteins encoded by recombinant genes can often be overcome by using

all of these
expression vectors
BACS
YACS

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

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