Bases are complementory to each other because of the size of the molecule. As the double ringed bases are longer than the single ring bases, the double ringed bases must go with each other. Therefore adenine is complementory with guanine. And cytosine is complementory with thymine.
Double ringed bases always bond with 3 hydrogen bonds, where single ringed bases only bond with 2.
The phosphate group always alternates with the deoxyribose group in the DNA structure.
Deoxyribose sugar's structure is a pentagon, where the phosphate is circular. The base always comes from the top corner of the sugar.
For each turn of a complete double helix, there is 10 bases
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