Recombinant DNA Technology
The transfer of antibiotic-resistant genes from genetically engineered bacteria to disease-causing bacteria __________ .

has occurred
would be of no concern if it occurred.
seems unlikely
can never occur

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Recombinant DNA Technology
An expression vector

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

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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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