TS EAMCET Medical 31 Jul 2022 Shift 2 Paper

The DNA molecule has 4 heterocyclic compounds namely 'A', 'B', 'C', and 'D'. In that ' A ' pairs with ' C ' by means of 2 hydrogen bonds, while ' B ' pairs with 'D' by means of 3 hydrogen bonds during formation of its double helical structure. Identify the names of ' A ', ' B ', ' C ', and ' D ', in the same sequence.