Anucleobase is a part ofRNA andDNA which may be involved in pairing (seebase pair). Nucleobases are important forgenetics.
They includecytosine,guanine,adenine,thymine in (DNA),uracil in (RNA) andxanthine andhypoxanthine (mutated forms of guanine and adenine). These are abbreviated as C, G, A, T, U, X and HXrespectively. They are usually simply calledbases in genetics. Because A, G, C and T appear in the DNA, these molecules are calledDNA-bases; A, G, C and U are calledRNA-bases.
Uracil replaces thymine in RNA.
