RNA bases

adenine purines
 pyrimidines
 uracil
- see below
guanine cytosine
The only difference between DNA and RNA bases is that uracil replaces thymine.
Uracil is like thymine - but without the methyl group (CH3-)at the top.
In each diagram above, an asterisk marks the position (H atom removed) when the base attaches to C1 of ribose by condensation.

Numbers represent atoms between which hydrogen bonds form across the centre of the DNA molecule (2 such hydrogen bonds in the case of A-U and 3 in the case of C-G).

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