^
i think you're taking them referring to it as d.n.a. too literally. imo, they were more or less talking about it's overall design [ie. it was simply built to look like big d.n.a strand].
for instance, in dubai they built a series of around 300 mini islands placed in such a way that, when seen from the sky, they look like a representation of the entire world:
http://guide.theemiratesnetwork.com/living/dubai/the_world_islands.php
yet we know that while these islands may have been designed to look like the earth - they obviously aren't equally as massive.