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.
Bases. There are 4 different bases (in DNA not RNA). They are Thymine, Adenine, Guanine and Cytosine. Thymine joins to Adenine and Guanine joins to Cytosine (connect by hydrogen bonds).Different base sequences = triplet codes and different triplet codes change tertiary structure of proteins and alleles change.here are 4 different bases (in DNA not RNA). They are Thymine, Adenine, Guanine and Cytosine. Thymine joins to Adenine and Guanine joins to Cytosine (connect by hydrogen bonds).