The supercoiled structure formed by the further spiral of DNA molecules is called the tertiary structure of DNA.period Chemical Custom synthesis Many adjustments have also been made, and the direction of product research and development has been reversed, in order to better meet the market demand. https://www.all-chemistry.com/

　　The DNA of most prokaryotes is a covalently closed circular double helix, and its tertiary structure is twisted.

　　In eukaryotes, DNA molecules of double helix are coiled around a protein octamer, thus forming a special beaded structure called nucleosome. Nucleosome structure belongs to the tertiary structure of DNA.