Recombinant DNA Technology
Restriction enzymes

protect bacteria from viral infection
All of these
cut DNAs producing a blunt end
cut DNA in a staggered fashion

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

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

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Recombinant DNA Technology
An expression vector

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

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Recombinant DNA Technology
Isoschizomers recognize

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

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