The four bases of DNA are usually referred to by letters. A, C and T are three. Which is the fourth letter?
DNA the cell, the conjugated bonds of nucleotide bases align perpendicular to the axis of the DNA molecule, minimizing their interaction with the solvation shell. The four bases found in DNA are adenine (A), cytosine (C), guanine (G) and thymine (T). These four bases are attached to the sugar-phosphate to form the complete nucleotide, as shown for adenosine monophosphate. Adenine pairs with thymine and guanine pairs with cytosine, forming A-T and G-C base pairs. The nucleobases are classified into two types: the purines, A and G, which are fused five- and six-membered heterocyclic compounds, and the pyrimidines, the six-membered rings C
Fourth Letter (Plato) nine tetraologies of four works apiece. In this arrangement, the Letters occupy the thirty-sixth and final place in the traditional Platonic corpus. Fourth Letter (Plato) The Fourth Letter, or Fourth Epistle, is one of thirteen letters which are traditionally attributed to Plato. Unlike the large majority of Plato's major works, the Letters are not Socratic dialogues. Further, despite their traditional attribution to Plato, the Letters are variously held to be spurious or suspect by modern scholarship. Collectively, the thirteen Letters are commonly grouped together as one larger item (called either Letters or Epistles). In turn, this larger collection of Letters