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

expression vectors
BACS
all of these
YACS

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Recombinant DNA
Vectors are

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

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