Well, one way we can measure the dissociation of our DNA is by measuring how much UV light, how much UV radiation is actually absorbed by the DNA molecule. Now, why is that important. Why is UV radiation or absorbents of UV radiation relevant? Well, because it turns out that if we have that double helix structure, because these bases are too busy forming those hydrogen bonds, they are not able to absorb as much light as the bases in the dissociated form can because these bases here are not forming any bonds. And so they're free to absorb that UV radiation. So if we shine light onto this structure here, these bases will be able to absorb much more UV radiation than in this particular case.