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Catalyst – Honors Bio

Catalyst – Honors Bio. What part of the cell controls what can come in and out of the cell? What types of cells have a cell membrane? What part of the cell produces proteins?. Agenda - Epsilon. Catalyst (5 min) Finish endosymbiosis poster (15 min) Cell membrane notes (15 min)

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Catalyst – Honors Bio

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  1. Catalyst – Honors Bio • What part of the cell controls what can come in and out of the cell? • What types of cells have a cell membrane? • What part of the cell produces proteins?

  2. Agenda - Epsilon Catalyst (5 min) Finish endosymbiosis poster (15 min) Cell membrane notes (15 min) Make cell membrane model (30 min) Inquiry into cell transport (15 min)

  3. Cell Membrane • Essential Question: • How does the cell membrane help maintain homeostasis in a cell?

  4. Why do we sweat when we get hot? We need to maintain a constant body temperature

  5. Homeostasis • ability to maintain a stable internal environment, even when the external environment changes! • happens in cells, organisms, and populations

  6. Homeostasis = Balance 98.6 oF

  7. How do cells maintain homeostasis? Have cell membrane which controls what goes in and out of the cell

  8. The Cell Membrane is… Selectively permeable /semipermeable What does this mean? Real-life examples?

  9. Semipermeable SPECIFIC substances allowed to enter or leave the cell Like a bouncer - only the people with valid IDs get in. Also not everything can get out. Some substance the cell wants to keep inside.

  10. Semipermeable • Which molecules can enter/leave depends on their size, charge, solubility and other chemical properties

  11. Structure of Cell Membrane Phospholipid bilayer

  12. Phospholipids Glycerol + phosphate = polar “head” Two fatty acid chains = non polar “tails” Head Tails

  13. Polar “head” hydrophillic (water-loving) • “Heads” face water inside and outside cell • Nonpolar “tails” hydrophobic (water fearing)

  14. Other molecules in bilayer Cholesterol strengths cell membrane Proteins: Some help molecules to cross the membrane (transport) Some used in communication Some are part of cytoskeleton Carbohydrates attached to proteins ID tags to distinguish different cell types

  15. Fluid Mosaic Model Phospholipid: • Cell membrane notstatic • Moves like a liquid • Proteins don’t flip direction though Tail = HYDROPHOBIC

  16. Video (until 2:20) Phospholipid: • http://www.youtube.com/watch?v=moPJkCbKjBs Tail = HYDROPHOBIC

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