Why is complementary base pairing important in DNA structure?
if A-T is paired with G-C then it must be complementary.
The structure of DNA relies on a base-pairing rule. This means that in DNA, Adenine binds to Thymine and Guanine binds to Cytosine. The complementary base is the base that binds to the base in question. Therefore A is complementary to T, C is complementary to G, etc. So if you had a strand of DNA, for example; ATT-CCA-GTC The complementary strand (which would bind to the above) would be; TAA-GGT-CAG