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Bellwork - HAVE SLATE ON DESK!. How is the cell membrane like a screened in porch or window? How is it not like a screened in porch? Copy the picture below. If the solute is a LARGE or CHARGED molecule, what is the ONLY thing that can pass the cell membrane? What is osmosis?
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Bellwork- HAVE SLATE ON DESK! • How is the cell membrane like a screened in porch or window? • How is it not like a screened in porch? • Copy the picture below. If the solute is a LARGE or CHARGED molecule, what is the ONLY thing that can pass the cell membrane? • What is osmosis? • Draw arrows on a circle showing which direction(s) water would move (in the pic below).
Cell Membrane Unit Essential Question How do our cells maintain equilibrium (balance) in a constantly changing environment? ___________________________________________________________________________________________________ Notes Labs Assignments Tests -3.5 Outline -Cell Membrane & Transport Notes -Egg Lab graph & conclusion
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
This duck egg GAINED weight in a 15% sugar solution • Which direction must water have moved? • Where is the higher concentration of solute (think about which direction water moves during osmosis)? • Is the 15% sugar solution iso-, hyper-, or hypo- tonic? • What % concentration is the sugar inside of the egg? • Why couldn’t the sugar have moved?
This duck egg LOST weight in a 75% sugar solution • Which direction must water have moved? • Where is the higher concentration of solute (think about which direction water moves during osmosis)? • Is the 75% sugar solution iso-, hyper-, or hypo- tonic? • What % concentration is the sugar inside of the egg? • Why is water able to move passively across membranes?
Bio 1-2 Finish graphing solute/concentration vs change in weight • 2. Complete conclusion (1 P) on back of graph paper Answer the 6 lab Qs AND include the following: -Use correct vocabulary (from notes, textbook) throughout to describe the results -Cite the textbook 1-3 times in support of your claims When finished- turn in graph & conclusion to front basket & pick up article on osmosis misconceptions