Most of the nuclear material consists of chromatin, the unstructured form of the cell's DNA that will organize to form chromosomes during mitosis or cell division. Also inside the nucleus is the nucleolus, an organelle that synthesizes protein-producing macromolecular assemblies called ribosomes.n these organisms, all the cell's information and administrative functions are dispersed throughout the cytoplasm. The spherical nucleus occupies about 10 percent of a cell's volume, making it the cell's most prominent feature.