Sugar Dna Strand Diagram. From this backbone extend the bases. The basic units of dna are nucleotides.
Adenine a cytosine c guanine g or. The ring of the sugar is flexible and non planar in contrast to the rings of the base and can adopt several conformations. This diagram misses out the carbon atoms in the ring for clarity.
The sugar and phosphate group together to create the sugar phosphate backbone.
Why are hydrogen bonds holding dna bases together. Double helix is the description of the structure of a dna molecule. B the two chains have anti parallel polarity. A dna molecule consists of two strands that wind around each other like a twisted ladder.