Recombinant DNA Technology
A human cDNA library

contains DNA for virtually all of the human proteins in vectors
None of these
contains DNA for specific human proteins
cannot be used to obtain human genes because it would be radioactive

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Recombinant DNA Technology
An expression vector

always contains an origin of replication
All of these
always contains DNA segments for the regulation of mRNA production
usually contains a gene that confers antibiotic resistance to the bacterial host

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