[SOLVED] BiOchem lab DNA electrophoresis 1) what is the the purpose of restriction endonucleases in prokaryotes? how do these organisms protect their DNA against the effects of their own restriction enzyme? 2)why is it important to use purified Dna samplesin restriction digest and gel electrophoresis? Rather then just using homogenized tissue? 3) why we use restriction enzyme and gel electophoresis in molecular biology?