You perform an experiment in which chromatin is isolated from sea urchin sperm cells and briefly digested with micrococcal nuclease. When the chromatin proteins are removed and the resulting purified DNA is analyzed by gel electrophoresis, you observe a series of DNA fragments that are multiples of 260 base pairs in length (that is, 260 bpbp, 520 bpbp, 780 bpbp, and so forth). Part A Although these results differ somewhat from the typical results discussed in the chapter in the textbook, explain why they still point to the likely existence of nucleosomes in this cell type.