If a segment of one side of a DNA molecule has 500 adenine bases, then the other side of the same DNA molecule has 500 thymine bases. There are four nitrogenous bases in DNA. Adenine and Thymine are two of them. The other two bases are Guanine and Cytosine. The order in which these four bases is read is responsible for telling a cell how to make the proteins that it needs to use to function properly. For example, the bases, in a certain order, will tell the cell to create the protein responsible for transferring oxygen in the bloodstream