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

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

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Recombinant DNA Technology
Isoschizomers recognize

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

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