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

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

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Recombinant DNA Technology
An expression vector

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

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