Shaun Rhodes - Intro to CELL MEMBRANE 1st.pdf - Name Date...

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Name: _________________________ Date: _______________________ Period: ________ STRUCTURE & FUNCTION OF THE CELL MEMBRANE Composition of the Cell Membrane: The fluid-mosaic model describes the cell (plasma) membrane of cells. The plasma membrane forms a boundary between the inner cell and the outside environment. It controls the passage of materials in and out of the cell. The cell membrane consist of a double layer of phospholipids embedded with proteins. We often call it the bilayer or phospholipid bilayer (fats with phosphorous attached). Each phospholipid molecule has a head (charged phosphate group & a glycerol), that is attracted to water ( hydrophilic : hydro = water; philic = loving) and 2 tails (lipid chains), that repels water ( hydrophobic : hydro = water; phobic = fearing). Both layers of the plasma membrane have the hydrophilic heads pointing toward the outside; the hydrophobic tails form the inside of the bilayer. (see diagram below) DIRECTIONS: Color and Label the phospholipid bilayer (cell membrane).

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