1. Cell Transport

2. Warm Up  Why is the enzyme-substrate relationship like a lock & key model?  Why did we not detect glucose when we added lactase to sucrose? (negative response)

3. Housekeeping  Macromolecules and Enzymes Quest next class  Macromolecules and Enzymes Review Pages due next class  Understand the enzyme lab  BRING YOUR LAPTOPS!

4. Recall organelles..  Where is the cell membrane?  What is the function of the cell membrane?

6. Selectively permeable: Only lets certain things through

7. Homeostasis  Maintaining stability/constancy (the same conditions)  Regulating movement of molecules from one side of membrane to the other Cell Transport  1. Passive Transport  A) Diffusion  B) Facilitated Diffusion  C) Osmosis  2. Active Transport

8. Passive Transport  The movement of materials across the cell membrane without using energy

9. Diffusion  The process by which particles move from an area of high concentration to an area of lower concentration

10. Facilitated Diffusion  When molecules pass through special protein channels  It’s still diffusion – doesn’t require energy!

11. Try It Yourself!  With your row, grab a beaker of water  Place a drop of food coloring in the water and observe. What happened?  On a piece of paper, draw a model (visual PLUS caption) of what you think happened. Use arrows & words.

13. Osmosis  The diffusion of water through a selectively permeable membrane  Recall…the cell membrane is made of what?  Lipid bilayer is hydrophobic. But the cell membrane contains aquaporins (water channel proteins)  High concentration  Low concentration

14. Osmosis

15.  Isotonic: Same amount of solute on both sides of membrane  Hypertonic: Higher concentration (compared to other side)  Hypotonic: Lower concentration (compared to other side)

17.  Draw a blood cell.  The cell is in fresh water.  Draw an arrow showing the direction in which the water will move. Label with appropriate terms (isotonic, hypertonic, hypotonic)

18. NEXT CLASS  Macromolecules and Enzymes Quest next class  Macromolecules and Enzymes Review Pages due next class  BRING YOUR LAPTOPS!

19. Active Transport  The movement of materials against a concentration gradient is known as active transport.  REQUIRES ENERGY.  Moves larger molecules  1. Exocytosis (out)  2. Endocytosis (in)

21. Don’t let the liquids touch!!