[10] 4. The radius of gyration for a circle is just the radius of the circle R, while the radius of gyration for a rod of length Lis L/12. Suppose that a DNA molecule could exist either as rigid rod 100 nm long, or as a circle with this circumference. Assuming that = 632 nm, calculate the ratio of light scattering at 0= 90 for the rod form to that of the circle form. If the minimum signal difference that can be measured by the detector is 5%, can the breaking of the circles be detected using light scattering? Suggest another method to measure the conformation of the DNA chain.