Each DNA base can be one of four nucleotides (A, T, C or G). Placed into a sequence with one another, they form a code which can be read by the cell to provide a blueprint for the creation of proteins. When forming a sequence of three nucleotides, the sequences TAA, TAG, and TGA are codes to tell the cell to stop reading the DNA. Assume each sequence of nucleotides is equally likely to be formed. A. How many possible ways are there to form a sequence of three nucleotides?