what are the four letters of the dna alphabet
Just like a reference book in the library, you can think of DNA as having words and letters. There are four letters in the DNA alphabet: A, C, G, and T, which stand for adenine, cytosine, guanine, and thymine. These are the names of special molecules called nitrogenous bases, which are often just called bases. Each word is made up of some combination of three letters, for a total of 64 possible words.