Q. What are the most important structures within the cell nucleus?
Within the cell nucleus the most important structures are the nucleolus, an optically dense region, spherical shaped, where there are concentrated ribosomal RNA (rRNA) associated to proteins (there may be more than one nucleolus in a nucleus) the chromatin, made of the DNA molecules dispersed in the nuclear matrix during the cell interphase the karyotecha, or nuclear membrane, the membrane that delimits the nucleus.