1. Bellwork- HAVE SLATE ON DESK! 1.How is the cell membrane like a screened in porch or window? 2.How is it not like a screened in porch? 3.Copy the picture below. If the solute is a LARGE or CHARGED molecule, what is the ONLY thing that can pass the cell membrane? 4.What is osmosis? 5.Draw arrows on a circle showing which direction(s) water would move (in the pic below).

2. Announcements 12 days until science fair data due

3. 1.Notes 2.Labs 3.Assignments 4.Tests -3.5 Outline -Cell Membrane & Transport Notes Cell Membrane Unit Essential Question How do our cells maintain equilibrium (balance) in a constantly changing environment? ___________________________ ________________________ ________________________ ________________________ -Egg Lab graph & conclusion

4. Cell Membrane & Transport Notes

5. 0% salt 25% sugar What does osmosis tell us about the salt & sugar concentrations INSIDE of the egg if “water follows the salt”? 50% salt Does this make sense? Think about what an egg is…

6. Names for concentrations:

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

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

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

10. How do you determine the concentration of the solute that was already inside of the egg?

11. 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?

12. 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?

13. 1.Finish graphing solute/concentration vs change in weight 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 2. Complete conclusion (1 P) on back of graph paper When finished- turn in graph & conclusion to front basket & pick up article on osmosis misconceptions Bio 1-2

14. 1.Finish graphing solute/concentration vs change in weight 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 2. Complete conclusion (2-3 P) on back of graph paper When finished- turn in graph & conclusion to front basket & pick up article on osmosis misconceptions Pre-AP