Base pair

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A base pair is made up of 2 complemetary bases, joined by Hydrogen bonds. Complementary bases include: A-T and C-G. There are 2 hydrogen bonds between A and T and 3 hydrogen bonds between C and G (can be remembered, as there are 3 letters between C and G in the alphabet).

Additional to this, base pairing occurs between a purine and a pyrimidine. Purine's are: adenine and guanine, and pyrimidine's are cytosine and thymine.

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