Recombinant DNA Technology
Isoschizomers recognize

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

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Recombinant DNA Technology
A human cDNA library

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

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Recombinant DNA Technology
An expression vector

All of these
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

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