So where are we?
DNA is the ětransforming principleî, and itís present in chromosomes.
DNA is a polymer of some kind, made up of monomers called nucleotides
Each nucleotide consists of a simple sugar, a phosphate group, and one of four possible bases.
DNA composition is different in different organisms, and yet its composition follows simple rules
The big problem remains: how does DNA work? To answer that, we have to understand its shape. . .