Recombinant DNA Technology
Both DNA gel electrophoresis and SDS-PAGE of proteins are similar because

in both cases molecules migrate to the anode
both techniques utilize the sieving properties of gels
both techniques rely on a constant charge to mass ratio
All of these

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Recombinant DNA Technology
An expression vector

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

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