Cell Nucleus

Cell Nucleus The nucleus is of primary importance in the cell because it is the control center that oversees the metabolic functioning of the cell and ultimately determines the cell's characteristics. Within the nucleus, there are masses of threads called chromatin, which is indistinct in the nondividing cell, but it condenses to chromosomes at the time of cell division. This is where the DNA resides. The nucleolus is the specialized part of chromatin in which the ribosomal RNA (rRNA), is produced.