Recombinant DNA Technology
An expression vector

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

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Recombinant DNA Technology
A human cDNA library

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

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