Used_in The definition of C++ [ c++.syntax.html ]. Used_in The definition of Java [ java.syntax.html ] Notation This uses my XBNF Extended BNF Notation where | indicates or, (...) indicates priority. For more information see [ intro_ebnf.html ].
To look at it in another way: Thymine(uracil in RNA) and cytosine are pyrimidines. Pyrimidines are single-ringed organic base that will only attach to purines, or adenine and guanine by hydrogen bond. Because cytosine and thymine are both pyrimidines, it cannot form a hydrogen bond with each other.
The four different nitrogenous bases; Adenine (A), Thymine (T), Guanine (G) and Cytosine (C) are the parts that are different on different nucleotides. These bases differ in â¦ their chemical structure: The pyrimidines, Cytosine and Thymine have one ring (with different side chains).NA (Deoxy ribo-nucleic acid) is made up of structures known as nucleotides, there are four nucleotides from which all the DNA coding has been written, which are as follow : adenine (a purine). cytosine (a pyrimidine). guanine (a purine).