In this unit, students will learn: — Cell theory, which is: (1) All organisms are composed of one or more cells. (2) The cell is the basic unit of structure and organization in organisms. (3) All cells come from preexisting cells. — The differences and similarities between the structures of plant, animal and bacterial cells. — The subcellular structures such as mitochondria, cell membrane, cytoplasm, nucleus and ribosomes. — The life cycle of a cell including growth, DNA replication, mitosis and