| Term | Definition |
|---|
| Cell Membrane | thin, flexible barrier around a cell; regulates what enters and leaves the cell |
| Phospholipid | a molecule composed of three basic parts: a charged phosphate group, glycerol, and two fatty acid chains |
| Fluid Mosaic Model | structural model of the plasma membrane where molecules are free to move sideways within a lipid bilayer |
| Selective Permeability | Feature of the plasma membrane that maintains homeostasis within a cell by allowing some molecules into the cell while keeping others out. |
| Receptor | a protein that detects a signal molecule and performs an action in response |
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