Recombinant DNA Technology
An expression vector

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

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Recombinant DNA Technology
Isoschizomers recognize

same recognition site and recognition sequence
different recognition site and different recognition sequence
same recognition site and different recognition sequence
same recognition sequence but different recognition site

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Recombinant DNA Technology
An example of a restriction fragment length polymorphism is

All of these
cystic fibrosis results from a three base deletion in most cases but in other cases, other mutations are involved
an Eco RI cuts DNA at a different sequence than Hind III
different length fragments of DNA resulting from loss or gain of a restriction site

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