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Cells

Cells . Day 1 – Diffusion, plasma membrane. Molecular Movement. Molecules are always in motion Move in straight lines until collision Dynamic equilibrium. Diffusion. High to low concentration No energy required (passive transport). Fluid Mosaic Model.

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Cells

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  1. Cells • Day 1 – Diffusion, plasma membrane

  2. Molecular Movement • Molecules are always in motion • Move in straight lines until collision • Dynamic equilibrium

  3. Diffusion • High to low concentration • No energy required (passive transport)

  4. Fluid Mosaic Model • Membrane molecules like a sheet of mosaic tiles, but fluid

  5. Main component of plasma membrane Polar head - hydrophilic Non-polar tails - hydrophobic Phospholipid Molecules Head Tails

  6. Lipid Bilayer • Inside and outside of cell primarily water • 2 layers of phospholipids face each other to form membrane (lipid bilayer)

  7. Phospholipid Tails • Saturated and unsaturated to keep structure fluid • Animation

  8. The Lipid Bilayer

  9. Diffusion through the Bilayer • Small molecules (O2, CO2) • Other non-polars – alcohol, fat-soluble vitamins • Through the pores between polar heads Pores Top View of Polar Heads

  10. Proteins • Embedded within the lipid bilayer • Surface only – peripheral proteins • Extend through membrane – integral proteins

  11. Peripheral Protein Integral Protein

  12. Integral vs. Peripheral • Integral – transport molecules across the plasma membrane • Peripheral - help create “identify” of the cell • Carbohydrate “dog tags” attached

  13. Carbohydrates

  14. Carbohydrates • Glycolipid – carb attached to phospholipid • Glycoprotein – carb attached to protein • Glycocalyx (“sugar coat”) – carbs and peripheral proteins on surface of cells

  15. Glycocalyx

  16. Cholesterol

  17. Cholesterol • Between tails of the phospholipids • Prevents tails from tangling • It also stabilizes the membrane.

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