So this process does not generally take place because these two negative charges essentially repel one another as a result of electrostatic repulsion. Now, the final components that we have to discuss, have left to discuss are the bases. So remember, any nucleotide consists of a phosphate group, a sugar molecule and a base. So let's take a look at what these nitrogenous bases actually are. Now, unlike in the backbone, where these essentially repeat throughout the entire nucleic acid, these bases do change when we go from one nucleotide to another nucleotide. And that's exactly what allows these bases and allows the DNA to ultimately store genetic information, as we'll see in just a moment.