1. UNIT 1 Cell Membranes Mrs. McGee

2. Do Now  Can drinking too much water kill you? Explain…

3. Learning Goal  Students will understand why cells are enclosed within a semipermeable membrane and how the membrane regulates their interaction within their surroundings. (NGSS HS- LS1.A.)  VOCAB: cellular transport, lipid bilayer, fluid mosaic model, polar/ non-polar, hydrophilic, hydrophobic, diffusion, osmosis, concentration, gradient, equilibrium

4. Monday’s Agenda  Do Now/ Collect HW  Hypothesis  Groups/ Set up Experiment  Explore  Notes  Vocab Chart

5. Create Hypothesis  If I place an egg in vinegar then ____________________________________ __________________________.  Write this under your Do Now

6. Group Assignments  3-5 Students per group  Remember to use positive language  Everyone completes their own worksheet

7. Start Experiment- 15mins  Your group will be given 2 eggs  Record the weight and circumference (widest part)  Write information in Day 1 Table Caution: Because these are raw eggs, they may carry salmonella, so you should use gloves when handling the eggs.

8. NOTES  Plasma membrane= Cell Membrane  Controls what enters and leaves a cell  Provides protection and support

9. Plasma Membrane  Two layers of lipids  Most contain protein molecules embedded in the lipid bilayer  Carbohydrate chains are attached to proteins

10. Cell Membrane=Semi-Permeable  Permeable: allowing liquids or gases to pass through it  Semi-permeable means allowing certain substances to pass through it but not others.

11. Main Role  Regulate the interaction with the surrounding environment and maintain homeostasis  Homeostasis: The ability of the body or a cell to seek and maintain a condition of equilibrium or stability within its internal environment when dealing with external changes

12. Closing  Complete Quietly  Answer question 1&2  Finish for HW

13. Day 2: Tuesday’s Agenda  Do Now  Check Experiment  Notes  Connections

14. Do Now  What is something similar to a cell membrane?  Example:

15. Day 2: Experiment- 10 minutes  Observe your eggs  Carefully handle your now fragile egg!  Dry each egg  Measure the weight and circumference  Record your results for Day 2 in the Table If you finish early answer question #3

16. Experiment: Changing Liquids  Empty the vinegar from the container for egg 1 and replace it with water to cover the egg.  Empty the vinegar from the container for egg 2 and replace it with corn syrup to cover the egg. As you pour the corn syrup, notice that it is viscous (thick, sticky). If you finish early answer question #4

17. Notes  REMINDER : During notes you are silent while the teacher is talking. If you have a question or comment raise your hand and wait silently to be called on.

18.  Diffusion: the overall movement of a substance (e.g., an atom, ion or molecule) from a region of high concentration to a region of low concentration.

19.  Smaller molecules can move freely between the inside and outside of cell membrane. Larger molecules cannot diffuse through the cell membrane, and require other mechanisms of transport to move.

20. OSMOSIS  Osmosis: process by which water diffuses through a selectively permeable membrane. In this case, the cellular membrane.  Water moves from an area where there are fewer molecules to an area where there are more molecules  Low solutes  High solutes

21. Day 3: Thursday’s Agenda  Do Now  Check Experiment  Answer Questions

22. DO NOW Share what you see in this piece of art. Think.Write.Share

23. Day 3- Experiment  Answer Questions #5-6  Rinse the corn syrup off of egg 2  Dry each egg  Measure and record the weight and/or circumference for day 3 in the table

24. Egg 2  Place egg in water  Add 1 drop of  food coloring

25. Clean Up  Throw away Egg 1  Rinse out container  Wipe off scales

26. Closing  Answer questions 7-8

27. Optional VIDEO  https://www.youtube.com/watch?v=Pfu1 DE9PK2w https://www.youtube.com/watch?v=Pfu1 DE9PK2w  Optional Activity  Food Coloring Activity

28. Day 4: Friday’s Agenda  Do Now  Reflections  Understanding Osmosis WS  Re-evaluate Big Question  Can water kill you? Why…

29. Check on Egg 2  Remove Egg 2  Observe  What happened?  How does this happen?  CLEAN UP Throw away Egg, Rinse out container, Wipe off scales and lab area

30. Complete Osmosis WS  Work in Groups

31. HW- LAB REPORT  Requirements Typed!  Complete Individually  Use Notes & Worksheet  DUE FRIDAY OCT. 2 nd