11.09.2008

DNA loop

Closed-loop DNA (closed circular DNA) no fracture of the ring double-stranded DNA, also known as the super-helix DNA. Due to their double-stranded helical structure of the closure, resulting in a further rotation of the entire DNA molecule formed by the three-tier structure of the song. In addition, if a chain of 2 or on different parts of a fracture, it will become a spin-free song of the open-loop DNA molecules. Cells extracted from the DNA plasmid or virus, there are elements of open-loop and closed loop these two elements. Both can be combined with the ability of the different pigments, and the two separated.