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Cell Membrane Structure

Cell Membrane Structure. BUBBLES!!. MUST wear goggles at ALL times! NO taking straw out of the dish! NO drinking/ inhaling bubble fluid THIS IS an EXPERIMENT!!! You can have fun, but ALL usual lab safety RULES APPLY!. Questions to think about:.

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Cell Membrane Structure

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  1. Cell Membrane Structure

  2. BUBBLES!! • MUST wear goggles at ALL times! • NO taking straw out of the dish! • NO drinking/ inhaling bubble fluid • THIS IS an EXPERIMENT!!! • You can have fun, but ALL usual lab safety RULES APPLY!

  3. Questions to think about: • Can anything pass through the bubble without breaking it? • Can one bubble divide to become several bubbles? • Can several bubbles merge to form one- how? • Can a drop of water pass through a bubble without popping it? • Does it look like the surface of the bubble moves? How can you tell?

  4. Bubble Summary! • A bubble is a lipid monolayer!! • How does a bubble model the fluid nature of a cell membrane? • What is the structure of the membranes of our cells?

  5. Diffusion Osmosis Selectively Permeable Passive Transport Active Transport Key words to know! • Hydrophilic • Hydrophobic • Cell Membrane • Fluid Mosaic Model • Phospholipid • Cholesterol AS Biology. Foundation. Cell membranes and Transport

  6. Learning Objectives • Describe the fluid mosaic model of membrane structure and explain the reasons for its structure. • Outline the roles of phospholipids, cholesterol, glycolipids, proteins and glycoproteins in membranes. • Outline the roles of the plasma membrane, and the roles of membranes within cells.

  7. Cell Membranes • AKA Plasma membrane • What are the functions of the cell membrane? • How does its structure allow it to carry out its functions?

  8. Cell (plasma) Membrane • Encloses the cell’s contents • Selectively Permiable- regulates which particles (nutrients, wastes) can enter and exit the cell. • Cell communication recognition AS Biology. Foundation. Cell membranes and Transport

  9. Cell Membranes: Every cell is enclosed by a double layer of phospholipids.

  10. Cell Membrane Structure • Building blocks are phospholipids… • Lipid with a phosphate group in place of one fatty acid chain. • Phosphate head is hydrophilic, fatty acid tail is hydrophobic. AS Biology. Foundation. Cell membranes and Transport

  11. Phospholipids have Split Personalities! • HYDROPHOBIC tails (the fatty acid portion)- HATE water!! • HYDROPHILIC heads (phosphate group)- LOVE water!! AS Biology. Foundation. Cell membranes and Transport

  12. PhospholipidBilayer

  13. Properties of Cell Membranes • Phospholipids act as a barrier to most water soluble substances... (“water and oil don’t mix”) AS Biology. Foundation. Cell membranes and Transport

  14. What is a mosaic?

  15. Fluid Mosaic Model Phosopholipids, cholesterol and proteinsform a mosaic (pattern) within the cell membrane AS Biology. Foundation. Cell membranes and Transport

  16. Why call it a Fluid Mosaic Model? FLUID- phospholipids and some proteins move around freely within the layer MOSAIC- the pattern produced by scattered protein molecules in the membrane. AS Biology. Foundation. Cell membranes and Transport

  17. Visualizing structure and function • http://www.youtube.com/watch?v=Rl5EmUQdkuI&feature=fvwp&NR=1&safe=active AS Biology. Foundation. Cell membranes and Transport

  18. Functions of Proteins in Cell Membrane • Proteins act as channels for substances to move in or out of cell. • Some act as membrane enzymes in chemical reactions. • Glycoproteinsact as receptorsfor cell communication and recognition. AS Biology. Foundation. Cell membranes and Transport

  19. Function of Cholesterol In Cell Membrane • Cholesterol (a lipid) is found between the phospholipid molecules in the cell membrane. • Help maintain stability of the membrane…not too fluid, not too rigid.

  20. Functions of components of cell membranes Component Description Function 1. Phospholipids 2. Proteins 3. Cholesterol AS Biology. Foundation. Cell membranes and Transport

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