Question

If the ATCG nucleotides are the ladder rungs in the double helix, am I right in assuming that there are no 'sides' to this ladder: that the rungs hold together vertically also?

Answer 1

I think you are because if i'm not mistaken RNA is not a double helix and holds itself vertically however since it's DNA i think you should assume tat there is a complementary strand

Answer 2

This diagram showing the structure of DNA might help. You'll see how the bases are attached to the backbone and how the sugars of the backbone are linked to each other. http://cnx.org/content/m12382/latest/dna.gif

Answer 3

Thank you.