How do the 4 nucleotides that makeup DNA differ?

Mainly in the 3-D physical conformationS of the Bases - A and T share two Hydrogen bonds while C and G share three H-bonds for maximum closeness of spacing yet most importantly for Complementarity DNA consists of adenine,guanine,cytosine and thymine while RNA consists of adenine,guanine,cytosine and uracil.

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