Recombinant DNA Technology
Restriction enzymes

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

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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
All of these
different length fragments of DNA resulting from loss or gain of a restriction site
cystic fibrosis results from a three base deletion in most cases but in other cases, other mutations are involved

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