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

all of these
expression vectors
YACS
BACS

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Recombinant DNA
Vectors are

molecules that are able to covalently bond to and carry foreign DNA into cells
molecules that help in replication
molecules that protect host cells from invasion by foreign DNA
molecules that degrade nucleic acids

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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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