Question

10.Describe how nucleotides and hydrogen bonds affect the structure of DNA.

Answer 1

Its simple...Take two rods & stick many bungees b/w them... Each bungee tries to shorten its length & VOILA your rods are now spiral...

Key Notes:
Bungees=H-Bonds
Rods=Nucleotide chain

Answer 2

If that was the case you would not get a spiral. There needs to be a difference in the amount of shortening. You need to include nucleotides and the differences between the 4 to explain the spiral.