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Since the 4 bases are composed of 2 purines (adenine and guanine) and 2 pyrimidines (cytosine and thymine), 1 purine is bonded to 1 pyrimidine (e.g. guanine-cytosine; adenine-thymine). And the bond or linkage between this purine and pyrimidine is because of HYDROGEN BONDING.

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15y ago

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