These long strands of coiled-up DNA and proteins are called chromosomes. Each chromosome contains many genes.. The eukaryotic cell nucleus. Visible in this diagram are the ribosome-studded double membranes of the nuclear envelope, the DNA (as chromatin), and the nucleolus. Within the nucleus is a viscous liquid called nucleoplasm, similar to.. A diagram of nucleus can be a helpful tool for understanding its structure and function. The diagram shows the different parts of the nucleus, such as the nuclear envelope, the chromatin, the nucleolus, and the nuclear pores.. During cell division, chromatin expands into chromosomes. Chromatin regulates gene expression by controlling DNA.
Structure of Nucleus/Parts of Nucleus 1. Chromatin/chromosomes. The nucleus, a pivotal cellular organelle, serves as the repository for chromosomes, which are the carriers of genetic information. Chromosomes are composed of DNA, the molecule that harbors genetic instructions vital for cellular functions such as growth, development, and.. It looks like a dark spot within the nucleus and is a dense, membrane-less structure composed of RNA and proteins along with granules and fibers that remain attached to chromatin. The nucleolus contains multipleregions called nucleolar organizers that are the segments of chromosomes that contain the genes for ribosomal RNA.