The DNA is then precipitated by adding isopropanol on the substantial-concentration salt solution. This forces the big genomic DNA molecules outside of solution, while the smaller RNA fragments stay soluble. The insoluble DNA is then pelleted and divided from salt, isopropanol and RNA fragments via centrifugation. There are two choices https://chanceddbzx.azuria-wiki.com/928599/reagents_in_dna_extraction_an_overview