By: Geoffrey Freeman
The Nucleus: The control center
The nucleus is separated from the rest of the cell by a nuclear envelope. This is composed of two parallel membranes which are separated by a narrow space and is perforated by small pores where two membranes unite. Macromolecules are able to move through the pores into or out of the nucleus and cytoplasm. Within the nucleus is a nucleolus which stains more intently because of its RNA content. Chromosomes, made with chromatin, are large units of genetic information within the cell and are bound to Histone proteins and are too small to be seen without high magnification. Mitosis is when the duplicated chromosomes are separated equally into daughter cells and Meiosis is when sex cells are created.