Firstly, we have nucleosides (Guanine, citosine, adenine and thymine ).
Also, we can see D-Ribose and ionic phosphate.
Later, we see as nucleotides are built with union of nucloside, phosphate and ribose.
Then, we can contemplate as nucleotides unite to build the pairs of nucleotides G-C and A-T. Also the position of the genetic code and conections for building the helical chain.
And finaly, we have the double helical chain built, in which we can see the position of the genetic code.
Also, in the last drawing, we can see how the helical chain can wind itself, due to the angle that riborse form.
A importante question we have to take in mind is that any atom has its particular behaviour.
So, carbon with oxygen ( yellow ) represent a gate or union point ( -- ).
Against, nitrogen ( blue ) represent a blockade direction ( O ).
Guanine and Adenine represent the coupling key with Citosine and Thymine when changing a double bond from the tetra group to the hexa group and vice verse.