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Bellwork - Have slate, marker & eraser on desk

Bellwork - Have slate, marker & eraser on desk. 1. Draw a BEFORE picture of YOUR egg in the beaker and label where you think these 4 things were at the BEGINNING of the experiment: sugar/salt, water, cell membrane and cell

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Bellwork - Have slate, marker & eraser on desk

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  1. Bellwork- Have slate, marker & eraser on desk 1. Draw a BEFORE picture of YOUR egg in the beaker and label where you think these 4 things were at the BEGINNING of the experiment: sugar/salt, water, cell membrane and cell 2. Draw an AFTER picture of YOUR egg in the beaker and label where you think these 4 things were at the END of the experiment: the sugar/salt, water, cell membrane, and cell 3. When finished complete your textbook notes for 3.5 (sections: inside & outside, diffusion, osmosis) OR review the textbook notes if already finished TIME IS UP @ 1:48

  2. 3.5 Cells and Their Environment Textbook Notes Textbook Time Vocabulary: 1. 2. Set up paper for textbook notes on these sections of 3.5 today: • Inside & Outside • Diffusion • Osmosis 3. 4. 5. 6. (not today) 7. (not today) Finished early? Begin graphing solute/ concvs change in weight for egg lab IV=X-axis, DV=y-axis Inside and Outside-Be prepared to stop: (sentence summaries- 1 sentence summary for each paragraph)

  3. What would be different about skateboarding UP this hill rather than DOWN it?

  4. Cell Membrane & Transport Notes

  5. Do you see WHERE in the membrane the small molecules would slip through? Passive Transport • Passive transport • Solute passes through membrane • NO energy required (like skateboarding DOWN a hill) • Only SMALL, uncharged molecules

  6. Active Transport Do you see WHERE in the membrane the large/charged molecules would get moved through? • Active Transport • Solute passes through membrane • ATP energy required (like going UP a hill) • Moves large & charged molecules

  7. Which kind of transport happened during the egg lab? Use the definitions to explain WHY.

  8. Passive Transport • Passive transport • A solute passes through the cell membrane • NO energy required (like skateboarding DOWN a hill) • Only SMALL, uncharged molecules can do this (salt breaks apart into Na+ and Cl- ions, and sugar is a large macromolecule)

  9. If the salt and sugar could not pass the membrane…WHAT DID MOVE? How did the eggs change weight?

  10. Osmosis!!! • Movement of water across a semi-permeable membrane: Water moves from LOWHIGH concentration areas Memory strategy: “Water follows the salt”

  11. What does osmosis tell us about the salt & sugar concentrations INSIDE of the egg if “water follows the salt”? 0% salt 25% sugar 50% salt Does this make sense? Think about what an egg is…

  12. Names for concentrations:

  13. Isotonic • Iso= same • Same concentration outside the cell as inside

  14. Hypertonic • Hyper= more/too much • Higher concentration solution outside the cell

  15. Hypotonic • Hypo= less/too little • Lower concentration solution outside the cell

  16. Closure • Use osmosis to explain why your fingers get wrinkly when you’re in a pool for too long.

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