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

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

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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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