Explain, in your own words, why these two steps are different.

. When we purify the plasmid DNA, we discard the white solid and keep the liquid after the first 10 min spin. After that, we add isopropanol to the sample, mix, and then centrifuge again for 10 minutes. After this second centrifugation, we discard the liquid and keep the white solid. Explain, in your own words, why these two steps are different. (4 points)