Within the cells of our body, the PH ranges from about six eight to about seven four. So based on that information, we can say that the average PH of our cells is around seven. Now, the question is, why exactly do the cells in our body spend so much energy trying to maintain a constant PH of seven? And more specifically, how exactly does change, changing the PH inside our cells effect the many different types of biological processes and reactions that take place within those cells? Now, what we're going to focus on in this lecture is how increasing the PH inside our nucleus of the cell actually changes the structure of the DNA, how it affects the double helix structure of the DNA, the formation of the double helix. So let's begin by looking at the following diagram that basically describes the relationship between the PH change and the structure of our DNA.