DNA bases are either pyrimidines (thymine, cytosine) with one ring, or purines (adenine, guanine) with two rings; complementary base pairing (A-T, C-G) is held together by hydrogen bonds in the double helix.
DNA bases are either pyrimidines (thymine, cytosine) with one ring, or purines (adenine, guanine) with two rings; complementary base pairing (A-T, C-G) is held together by hydrogen bonds in the double helix.
| Front | DNA bases 2.1.3(a) |
|---|---|
| Back | - T and C are pyramidines (1 carbon ring so smaller) - A and G are purines (2 carbon rings so larger) - complementary (AT and CG), held by H2 bonds which holds polynucleotide strands together in double helix |
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