| A | B |
|---|
| Cell | basic unit of all forms of life |
| Cell Theory | the concept that cells are the basic unit of life and that cells only come from other cells |
| Cell Membrane | thin, flexible, barrier that surrounds all cells; regulates what enters and leaves the cell |
| Nucleus | in cells, structure that contains the cell's genetic material in the form of DNA |
| Eukaryote | organism whose cells contain a nucleus |
| Prokaryote | unicellular organisms that lack a nucleus |
| Cytoplasm | fluid portion of the cell outside the nucleus |
| Organelle | specialized structure that performs important cellular functions within a eukaryotic cell |
| Ribosome | cell organelle consisting of RNA and protein found throughout the cytoplasm in a cell; the site of protein synthesis |
| Endoplasmic Reticulum | internal membrane system found in eukaryotic cells; place where lipid components of the cell membrane are assembled |
| Golgi Apparatus | organelle in cells that modifies, sorts, and packages proteins and other materials from the endoplasmic reticulum for storage in the cell or release outside the cell |
| Vacuole | Cell organelle that stores materials such as water, salts, proteins and carbohydrates |
| Lysosome | cell organelle that breaks down lipids, carbohydrates, and proteins into small molecules that can be used by the rest of the cell |
| Cytoskeleton | network of protein filaments in a eukaryotic cell that gives the cell its shape and internal organization and is involved in movement |
| Mitochondria | cell organelle that converts the chemical energy stored in food into compounds that are more convenient for the cell to use |
| Cell Wall | strong, supporting layer around the cell membrane in most prokaryotes and some eukaryotes |
| Lipid Bilayer | flexible double layered sheet that makes up the cell membrane and forms a barrier between the cell and its surroundings |
| Selectively Permeable | property of biological membranes that allows some substances to pass across it while others cannot; also called semipermeable membrane |
