what are the different complementary base sets?
A complementary strand of DNA or RNA may be constructed based on nucleobase complementarity. Each base pair, A=T vs. Gâ¡C,takes up roughly the same space, thereby enabling a twisted DNA double helix formation without any spacial distortions. Hydrogen bonding between the nucleobases also stabilizes the DNA double helix.
Complementarity is achieved by distinct interactions between nucleobases: adenine, thymine (uracil in RNA), guanine and cytosine. Adenine and guanine are purines, while thymine, cytosine and uracil are pyrimidines. Purines are larger than pyrimidines.