The document compares structures and organelles in a cell to parts of a school. The main office is likened to the nucleus as the control center of the cell and school. The principal directs operations just as the nucleolus directs cellular systems. Hallways transport students around the school, similar to how the endoplasmic reticulum transports materials within the cell. The mitochondrion and cafeteria both produce energy for their respective systems. Other comparisons are made between vacuoles and the library, lysosomes and janitors, ribosomes and vice principals, chromatin and teachers, and the cell membrane and school doors/walls. Chromosomes store cellular information just as books and computers store information for a school.