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Ethanol precipitation is a method used to purify and/or concentrate RNA, DNA and polysaccharides such as pectin and xyloglucan from aqueous solutions by adding ethanol as an antisolvent.Contents.thanol precipitation is a method used to purify and/or concentrate RNA, DNA and polysaccharides such as pectin and xyloglucan from aqueous solutions by adding ethanol as an antisolvent. Contents.
DNA ligase is responsible for joining together fragments of DNA. In DNA replication, after the primers are replaced by DNA Polymerase I, DNA ligase assists in the formation ph â¦ osphodiester bonds between the fragments.This is essential for creating one continuous strand.NA helicase unzip, or separate, a strand of DNA at positions  called origins. This means that the hydrogen bonds between  complementary base pairs are removed (DNA is dou â¦ ble stranded!).  When they separate double-stranded DNA into single strands, it  allows each strand to be copied (replication).