1. Membranes

2. Homework

3. Objectives Be able to calculate a solution’s concentration Identify solutions as being hypertonic, hypotonic, or isotonic Learn how osmosis works

4. Study! Key concepts so far this unit. If you can’t explain these things, you need to study: –How to recognize a lipid –What shape a phospholipid is –Hydrophilic vs hydrophobic, and which part of the phospholipid is which –Why phospholipids form a phospholipid bilayer, and which parts are on the inside vs outside of the bilayer –Why diffusion happens the way that it does –The difference between simple and faciliated diffusion

5. Egg Lab

6. Solutions Solution: a mixture of a solute dissolved in a solvent. When talking about concentration on either side of a membrane, we have names for types of solutions. Solution: a mixture of a solute dissolved in a solvent. When talking about concentration on either side of a membrane, we have names for types of solutions.

7. Solutions Latin/Greek Parts Sheet out: Hyper Hypo Iso Latin/Greek Parts Sheet out: Hyper Hypo Iso

8. Solutions Hypertonic: more concentrated than the other solution Hypotonic: less concentrated than the other solution Isotonic: equally concentrated as the other solution Hypertonic: more concentrated than the other solution Hypotonic: less concentrated than the other solution Isotonic: equally concentrated as the other solution

9. Solution Concentrations Concentration is not about the amount of stuff. It’s like density: all about the comparison between amounts. Concentration is written as amount of solute divided by amount of solvent. (Solute/Solvent.) What units do you think we would use for it? Concentration is not about the amount of stuff. It’s like density: all about the comparison between amounts. Concentration is written as amount of solute divided by amount of solvent. (Solute/Solvent.) What units do you think we would use for it?

10. Solution Concentration Get one whiteboard per table! If I have 5 salt molecules and 5 water molecules, what is the concentration? Show the math, and draw a diagram. Get one whiteboard per table! If I have 5 salt molecules and 5 water molecules, what is the concentration? Show the math, and draw a diagram.

11. Solution Concentration If I have 1 g of salt and 1 mL of water, what’s the concentration? Math and diagram If I have 1 g of salt and 1 mL of water, what’s the concentration? Math and diagram

12. Solution Concentration If I have 100000 g of salt and 100000 mL of water, what’s the concentration? Math, and your diagram can be imprecise If I have 100000 g of salt and 100000 mL of water, what’s the concentration? Math, and your diagram can be imprecise

13. Solution Concentration Which is more concentrated? 4 g of solute in 2 mL of solvent 400 g of solute in 400 mL of solvent Which is more concentrated? 4 g of solute in 2 mL of solvent 400 g of solute in 400 mL of solvent

14. Solutions 1.If I have a solution that’s 5 g/mL on Side A of a membrane and 10 g/mL on Side B, what do we call the two sides? 2.50 g/mL on Side A and 100 g/mL on Side B? 3.6 g/mL on Side A and 6 g/mL on Side B? 1.If I have a solution that’s 5 g/mL on Side A of a membrane and 10 g/mL on Side B, what do we call the two sides? 2.50 g/mL on Side A and 100 g/mL on Side B? 3.6 g/mL on Side A and 6 g/mL on Side B?

15. Solutions 1.If I have 5 salt molecules and 15 water molecules on Side A, and 10 salt molecules and 15 water molecules on Side B, what do I call the two sides? 2.Side A: 5 salt, 5 water. Side B: 5 salt, 5 water. 3.Side A: 10 salt, 5 water. Side B: 50 salt, 50 water. 1.If I have 5 salt molecules and 15 water molecules on Side A, and 10 salt molecules and 15 water molecules on Side B, what do I call the two sides? 2.Side A: 5 salt, 5 water. Side B: 5 salt, 5 water. 3.Side A: 10 salt, 5 water. Side B: 50 salt, 50 water.

16. Osmosis String = cell membrane. Left side = in cell, right side = outside. Popcorn = water. Water CAN diffuse across the plasma membrane. Stones = solute, like salt or sugar. It CANNOT diffuse across the plasma membrane. String = cell membrane. Left side = in cell, right side = outside. Popcorn = water. Water CAN diffuse across the plasma membrane. Stones = solute, like salt or sugar. It CANNOT diffuse across the plasma membrane.

17. Osmosis Osmosis = the diffusion of water across a selectively permeable membrane.

18. Osmosis Each table, take a whiteboard, whiteboard marker, and eraser. Use X for solute (like salt), O for solvent (water). Each table, take a whiteboard, whiteboard marker, and eraser. Use X for solute (like salt), O for solvent (water).

19. Osmosis Divide the board as shown, drawing in the table. Draw a diagram of a cell in a hypertonic solution, and fill in the first part of the table. Divide the board as shown, drawing in the table. Draw a diagram of a cell in a hypertonic solution, and fill in the first part of the table.

20. Osmosis Now draw what happens to that cell. Fill in the rest of the table.

21. Osmosis Draw a diagram of a cell in an isotonic solution.

22. Osmosis Draw a diagram of a cell in hypotonic solution. Don’t erase it when you’re done.

23. Osmosis Draw another diagram next to or below it, showing what will have happened to the cell because it was placed in that hypotonic solution.

24. Osmosis If I put a cell in a hypertonic solution, will the cell swell, shrivel, or stay the same?

25. Osmosis Draw two diagrams, a before and an after, showing what happens when you put a red blood cell in a hypertonic solution.

26. Osmosis Draw two diagrams, a before and an after, showing what happens when you put a red blood cell in a hypotonic solution.

27. Osmosis What kinds of solutions were the red blood cells in A, B, and C placed in?

28. Osmosis A salt water fish, used to living in ocean waters with high salt concentrations, is mistakenly placed in a fresh water aquarium. Draw two diagrams showing what happens to the fish’s cells.

29. Osmosis Sprinkling salt on a leech or slug’s wet skin causes serious damage to the poor animal. Draw diagrams of a slug’s cell showing why.

31. Osmosis 1.Sprinkling salt on a leech or slug’s wet skin causes serious damage to the poor animal. Use osmosis to explain why. 2.Have your notebook and macromolecule table ready.

32. Today’s Agenda Active Transport Finish Lipids part of macromolecule table Review

33. Osmosis http://highered.mcgraw- hill.com/sites/0072495855/student_vie w0/chapter2/animation__how_osmosis_ works.htmlhttp://highered.mcgraw- hill.com/sites/0072495855/student_vie w0/chapter2/animation__how_osmosis_ works.html http://highered.mcgraw- hill.com/sites/0072495855/student_vie w0/chapter2/animation__how_osmosis_ works.htmlhttp://highered.mcgraw- hill.com/sites/0072495855/student_vie w0/chapter2/animation__how_osmosis_ works.html

35. Cell Membrane So we’ve seen 3 ways of moving stuff in and out of a cell. Remind me what they are: Simple Diffusion = Facilitated Diffusion = Osmosis = So we’ve seen 3 ways of moving stuff in and out of a cell. Remind me what they are: Simple Diffusion = Facilitated Diffusion = Osmosis =

36. Active Transport Active Transport = using proteins embedded in the cell membrane to move things in or out of the cell, costing the cell energy. Active Transport is exactly what it sounds like: the cell actively pulls stuff in or kicks stuff out. http://www.youtube.com/watch?v=STzOiRqzzL4 Active Transport = using proteins embedded in the cell membrane to move things in or out of the cell, costing the cell energy. Active Transport is exactly what it sounds like: the cell actively pulls stuff in or kicks stuff out. http://www.youtube.com/watch?v=STzOiRqzzL4

37. Getting In/Getting Out Divide a piece of paper into four quadrants. In each quadrant, draw a labeled diagram or image of the four ways that things move in and out of cells. Beneath the drawing, briefly define or explain the process. Check with a classmate if you’re not sure you’ve done it right. Divide a piece of paper into four quadrants. In each quadrant, draw a labeled diagram or image of the four ways that things move in and out of cells. Beneath the drawing, briefly define or explain the process. Check with a classmate if you’re not sure you’ve done it right.

38. Quiz NOT BEING GRADED. This is just for you and I to see how well you understand what we’ve done so far. Take out a piece of paper, write your name, put away your notes. NOT BEING GRADED. This is just for you and I to see how well you understand what we’ve done so far. Take out a piece of paper, write your name, put away your notes.

40. Egg Lab Report

41. Homework Egg Lab Due 10/26 Test on Membranes & Diffusion coming up Reminder: Virus Brochures due 11/13

42. Egg Lab GET MY HELP This is a chance for me to help you see the level of writing I expect Use the checklist to be sure you’re including everything Complete paragraphs. You don’t have to talk about the topics in my order, put them in an order that makes sense in the paragraph. CONNECT THE IDEAS.