Recombinant DNA Technology
A plasmid

always contains an origin of replication
usually contains one or more restriction sites
All of these
is a circular DNA molecule

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

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
All of these
an Eco RI cuts DNA at a different sequence than Hind III

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Recombinant DNA Technology
A human cDNA library

None of these
cannot be used to obtain human genes because it would be radioactive
contains DNA for specific human proteins
contains DNA for virtually all of the human proteins in vectors

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