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Plasma Membrane.

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Presentation on theme: "Plasma Membrane."— Presentation transcript:

1 Plasma Membrane

2 Function Allows nutrients to pass into and out of the cell.
Maintains homeostasis.

3 Structure Composed of a phospholipid bilayer called the fluid mosaic model.

4 Structure Structure of phospholipid bilayer:
Each phospholipid contains a glycerol backbone, 2 fatty acid chains, and a phosphate group. A phosphate is formed by replacing one fatty acid in a lipid with a phosphate group.

5 Structure Structure of phospholipid bilayer:
Each phosphate group has two fatty acid tails that are nonpolar and one head containing a polar phosphate group. The nonpolar tails stop water-soluble molecules form moving through the membrane. The polar head interacts with the watery environment inside and outside the cell.

6 Structure The phospholipid bilayer also contains: Cholesterol
Transport Proteins Proteins Carbohydrates

7 Structure Function of cholesterol: Function of transport proteins:
Stabilizes the membrane by preventing the fatty acid tails from sticking together. Function of transport proteins: Span the entire membrane to move substances through the plasma membrane.

8 Structure Function of carbohydrates:
Stick out of the surface of the cell along with proteins in order to identify chemical signals. Function of proteins at inner surface: Attach the plasma membrane to the internal support structure of the cell. Give flexibility.

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