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SC B- 2.5: Explain how active, passive, and facilitated transport serve to maintain the homeostasis of the cell.

Honors Biology Chapter 7Section 3 Cell Boundaries. SC B- 2.5: Explain how active, passive, and facilitated transport serve to maintain the homeostasis of the cell. Cell Membrane. surround all cells is a thin, flexible barrier that acts like the cell’s “gate keeper” made of lipid- bilayer

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SC B- 2.5: Explain how active, passive, and facilitated transport serve to maintain the homeostasis of the cell.

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  1. Honors Biology Chapter 7Section 3 Cell Boundaries SC B- 2.5: Explain how active, passive, and facilitated transport serve to maintain the homeostasis of the cell.

  2. Cell Membrane • surround all cells • is a thin, flexible barrier that acts like the cell’s “gate keeper” • made of lipid-bilayer • provides protection & support

  3. Cell Membrane: Lipid-Bilayer • Fluid Mosaic Model • phospholipids

  4. Plasma MembraneFluid Mosaic Model • resembles an ever-moving sea of fluid lipids that has large proteins bobbing along throughout the lipids

  5. Membrane Lipids • Phospholipids (~70% of membrane) • Cholesterol: • changes fluidity of membrane • Glycolipids • sugar molecule on lipid

  6. Membrane Proteins • Integral Proteins • go all the way thru the membrane • channel proteins • receptor proteins • Peripheral Proteins • on inside or outside of membrane • +/- attached to integral proteins

  7. Cell Membrane

  8. Cell Walls • found in: • plant cells • fungi cells • algae • bacteria • secreted by cell membrane • allow O2, CO2, glucose, & H2O to pass through

  9. Cell Wall

  10. Cell Wall

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