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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 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
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)
What would be different about skateboarding UP this hill rather than DOWN it?
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
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
Which kind of transport happened during the egg lab? Use the definitions to explain WHY.
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)
If the salt and sugar could not pass the membrane…WHAT DID MOVE? How did the eggs change weight?
Osmosis!!! • Movement of water across a semi-permeable membrane: Water moves from LOWHIGH concentration areas Memory strategy: “Water follows the salt”
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…
Isotonic • Iso= same • Same concentration outside the cell as inside
Hypertonic • Hyper= more/too much • Higher concentration solution outside the cell
Hypotonic • Hypo= less/too little • Lower concentration solution outside the cell
Closure • Use osmosis to explain why your fingers get wrinkly when you’re in a pool for too long.