BIOL 103 Chapter 3: Structure and Function of Cells
Document Summary
Cell doctrine: all living things are composed of cells and cell products, a single cell is the smallest unit that exhibits all the characteristics of life, all cells come only from preexisting cells. 3. 1: cells are classified according to their internal organization. All cells are surrounded by an outer membrane called the plasma membrane: plasma membrane encloses the material inside of the cell, which is mostly water, ions, b. and enzymes. Think the plasma membrane as the front door of a house: only a certain amount of things are welcomed inside. Eukaryotes: plasma membrane, a nucleus ( core ) or information center . Think the nucleus as the owner of the house: cytoplasm ( cell material ) that includes everything inside the cell except the nucleus. This cell material is composed of cytosol and cytosol contains organelles that carry out specialized functions.