There are 4 possible organic bases - A = adenine
T= Thymine
G = Guanine
C = Cytosine
Each base can only join to its complimentary bases. A joins to T and G joins to C.
the organic base is the only part of DNA that changes. The phosphate and sugar group stay the same.
Organic bases are of two types; double and single ringed.
Double ringed = A and G, Guanine produces 3 hydrogen bonds
Single ringed = C and T, Thymine produces 2 hydrogen bonds.
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