The Studies of James Watson and Francis Crick on the molecule of ADN, with the skill of diffraction of x-rays, they allowed them to know different information on the dimensions and the structure of the molecules, it is formed by two spiral chains wound about the same axis. The linkage between nucleótidos takes place of such form, that the groups phosphate are joined with carbono5'de the pentosa of a nucleótido and carbono3 ´ of the pentosa of the following nucleótido, the pentosa and the groups phosphate constitute the skeleton of the helix, where they place the base towards his interior that's why his form dextrógiras and antiparallel, the diameter of the helix is constant, of such form if the bases join púricas of a chain with the pirimidímica of other one.
The only possible unions had to be citosona-guanina and adenina-timina, the sequence of the bases in a chain does not seem to have any restriction, whereas the sequence of the second chain is determined for being the complementary one of the first one.
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