After Watson and Crick thereby creating DNA model according to the concept of the polynucleotide 2 late alternate direction. 3 ends of one pair with the 5 of another line. Bass A of one match the base T of another line and base C of one match the base G of another line. Then proposes the molecular structure of DNA that contain poly. Being Leo tide 2 string bass in each line of DNA a base pair (complementary base pair) seized by the bonds. Hydrogen the bass A matching with the base T and bass C matching with the base G the direction from the tip end to 5 3 but contrast and thousands, twisted pair. (double helix) clockwise twist around each away equally and have a base pair.