This strand of DNA can be extended up as far as you want (this would need to be decided by Lego if it gets accepted). It has a light gray base for the neutral parts of it, and color coded pieces for the different molecules that make up the DNA:
Orange for Cytosine
Red for Guanine
Green for Thymine
Blue for Adenine
The red and orange always connect, as does the blue and green, just like real DNA, except of course the molecules are not necessarily those colors. This is meant to be put on a desk, much like people will have photos and maybe a plant in their office.
The pieces at the base allow it to be more stable.