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CELL MEMBRANE

CELL MEMBRANE. Membrane Models. How does the amphipathic properties of phosopholipids and membrane proteins support the fluid mosaic model?. Fluid Mosaic Model. What evidence supports the fluid mosaic model of the cell membrane? What is meant by membrane fluidity?

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CELL MEMBRANE

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  1. CELL MEMBRANE

  2. Membrane Models • How does the amphipathic properties of phosopholipids and membrane proteins support the fluid mosaic model?

  3. Fluid Mosaic Model • What evidence supports the fluid mosaic model of the cell membrane? • What is meant by membrane fluidity? • How is fluidity reduced in animal cells?

  4. Membrane Matrix • What are the two types of membrane proteins? • How are the two sides of the membrane different? • What are roles of membrane proteins? • What is the function of membrane carbohydrates?

  5. Semi-permiable Membrane • Which molecules easily cross the membrane? • How are molecules transported that do not easily cross?

  6. Diffusion • Any substance will diffuse down its “concentration gradient”. What does that mean? • Compare the diffusion of one solute to that of two solutes. • Diffusion is a form of passive transport. What does that mean?

  7. Osmosis • Define the following, and explain what cells do when placed in these solutions: • Hypotonic • Hypertonic • Isotonic • How does the U-shaped tube demonstrate osmosis.

  8. Water Balance • How does the Paramecium maintain osmoregulation? • What causes a plant cell to be turgid? Flaccid? Plasmolyzed?

  9. Active Transport • What is meant by facilitated diffusion? • How do active and passive transport differ?

  10. Ion Pumps • Describe the sodium-potassium pump. • How does the membrane generate voltage? • What can the cell do with the voltage generated in the membrane? • Define cotransport and give an example.

  11. Transport of Large Molecules • What is the difference between exocytosis and endocytosis? • Describe an example of receptor-mediated endocytosis.

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