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Hristina Bundalo
Chapter 7.1-7.2
| Term | Definition |
|---|---|
| Cell | basic units of living organisms |
| Compound light microscope | Uses a series of lenses to magnify objects in steps |
| Cell theory | 1. All organisms are composed of one or more cells 2. The cell is the basic unit of structure and orginization of organisms 3. All cells come from preexisting cells |
| Electron microscope | Uses a beam of electrons instead of light to magnify structures up to 500,000 times their actual size, allowing scientists to see structures within the cell |
| Organelle | All cells contain smal, specialized structures called these |
| Prokaryote | Unicellular organisms, such as bacteria, do not have membrane-bound organelles |
| Eukaryote | Multicellular organisms made up of eukaryotic cells |
| Nucleus | The central membrane bound organelle that manages or controls cellular functions |
| Plasma membrane | The flexible boundary between the cell and its environment, to allow a steady supply of these nutrients to come to the cell no matter what the external conditions are |
| Selective permeability | A process in which a membrane allows some molecules to pass through while keeping others out, |
| Phospholipid | Has a glycerol backbone, two fatty acid chains |
| Fluid mosaic model | The phospholipids move within the membrane just as water molecules move with the currents in a lake. |
| Transport protein | Move needed substances or waste materials thought the plasma membrane |
| Organization | the orderly structure of cells in an organism |
| Ion | an atom or group of atoms with positive or negative electrical charges |
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