Cell Membrane (the “body guard”) Pg 19

1. Cell Membrane (the “body guard”) Pg 19

2. The cell membrane is the body guard of the cell. The cell membrane,also called the plasma membrane is the “body guard” of all cells.

3. The cell membrane is the body guard of the cell. The cell membrane is selectively permeable. It regulates what enters and exits the cell. What do you think is the main function of this organelle?

4. The cell (plasma) membrane is made of: lipids proteins carbohydrates

5. It is mostly made of a phospholipid bilayer. Phospholipid = polymer of lipids (glycerol head + fatty acid tail) Bilayer = two layers

7. Hydrophilic:loves water Hydrophobic:fears water

8. There is water inside and outside of the cell.

9. This is a fluid mosaic model. Hydrophilic:water loving Hydrophobic: water fearing Hydrophilic:water loving

10. Are located throughout the cell membranestructure. Allows molecules to pass through the membrane Does not require energy (ATP) Protein channels

11. Are located throughout the cell membranestructure. Allows molecules to pass through the membrane Do require energy (ATP) to move molecules from low to high concentration Protein pumps

12. Carbohydrates serve as receptors. They receive signals and help with cell-cell recognition.

13. 1. Which 3 biomolecules make up the cell membrane? • 2. Which part of the phospholipid is hydrophilic? • 3. What does hydrophilic mean? • 4. Which part of the phospholipid is hydrophobic? • 5. What does hydrophobic mean? • 6. What does selectively permeable mean?

14. Color background blue to represent water Color the glycerol heads green. Label them “hydrophilic.” Color the fatty acid tails red. Label them “hydrophobic.” Glue to pg 20 and label it

15. Cell Membrane (Transport) Notes Cell Membrane: • ALLcells have a cell membrane made of lipids, proteins, and carbohydrates. protein channel Layer 1 Cell Membrane Layer 2 lipid bilayer protein pump Cell Membrane Cell Wall • SOME cells (i.e. plants and bacteria) have cell membranes andcell walls A B

16. Function of the Cell Membrane: • Cell membrane separates the components of a cell from its environment—surrounds the cell • “Gatekeeper” of the cell—regulates the flow of materials into and out of cell—selectively permeable • Cell membrane helps cells maintain homeostasis—stable internal balance

17. Cell transport Passive Transport (pg 21) A process that does not require energy to move molecules from a HIGH to LOW concentration • Diffusion • Facilitated Diffusion • Osmosis

18. outside of cell inside of cell • Diffusionis the movement of small particles across a selectively permeablemembrane like thecell membrane until equilibrium is reached. These particles move from an area of high concentration to an area of low concentration.

19. Diffusion starts at an area of... High Concentration = thumbs up Low Concentration = thumbs down

20. Osmosis is the diffusion of water through a selectively permeable membrane like the cellmembrane Water diffuses across a membrane from an area of high WATER concentration to an area of low WATER concentration. Why is the water rising on the right side? What is it trying to achieve?

21. Homeostasis = Balance

23. Osmosis is the movement of Molecules = thumbs up Water (H20) = thumbs down

24. Glucose molecules outside of cell inside of cell • Facilitated Diffusion is the movement of larger molecules like glucose through the cell membrane. The larger molecules must pass through protein channels.

25. Why are protein channels needed for glucose molecules? Click

26. Passive Transport pg 22 ____ _____: the movement of particles down the concentration gradient from a ______ to a _____ concentration. Diffusion continues until the concentration of the molecules reach __________ (balance). • Simple diffusion • high • low • homeostasis

27. Passive Transport pg 22 Simple diffusion: the movement of particles down the concentration gradient from a high to a low concentration. Diffusion continues until the concentration of the molecules reach homeostasis (balance).

28. Passive Transport pg 22 _____ ______: diffusion of molecules across the cell membrane through _______. Facilitated diffusion is faster than simple diffusion. Though the proteins help the molecules cross the cell membrane, it still requires no energy and is classified as ____ transport. • Facilitated diffusion • Proteins • Passive

29. Passive Transport pg 22 Facilitated diffusion: diffusion of molecules across the cell membrane through proteins. Facilitated diffusion is faster than simple diffusion. Though the proteins help the molecules cross the cell membrane, it still requires no energy and is classified as passive transport.

30. To Do... • Glue cell membrane to pg 20 • GlueCellular transport notes to 21

31. Warm Up 9/19/18 Topic: cellular transport Look at the diagram of a cross-section of a cell membrane below. The cell membrane controls movement of materials into and out of the cell. The following particles are moving from high concentration to low concentration and are using a carrier protein. How would you describe this type of movement across the membrane? A. simple osmosis B. active transport C. simple diffusion D. facilitated diffusion

32. Warm Up 9/18/18 Topic: cellular transport Look at the diagram of a cross-section of a cell membrane below. The cell membrane controls movement of materials into and out of the cell. The following particles are moving from high concentration to low concentration and are using a carrier protein. How would you describe this type of movement across the membrane? A. simple osmosis B. active transport C. simple diffusion D. facilitated diffusion

33. The Gobstopper Lab

34. Get into groups of 4-5 Leader- direct the group and keep group members on task Timekeeper- the only person who has their cell phone out to keep track of the time Reporter- writes down observations for group members to copy Materials/Clean up- clean up spills of water, throw away trash Investigator- the only person that needs to ask questions for the group

35. Hypothesis If four gobstoppers are placed in a petri dish of water for 10 minutes then______________________ because_____________________________________________

36. Materials • piece of white paper • petri dish • water in a small beaker • 4 different colored Gobstoppers • colored pencils or crayons

37. Procedure • Place a petri dish on a sheet of white paper and fill it almost to the top with water.

38. Procedure 2. Equally space 4 Gobstoppers in the petri dish

39. Procedure 3. Observe and record what you see every minute for 10 minutes. Be sure to observe from the top and the sides. At the end of the 10 minutes, make a sketch.

40. Procedure 4. When you are finished return your materials, clean your work area, and complete your conclusion.

41. Procedure 4. When you are finished return your materials, clean your work area, and complete your conclusion.

42. Conclusion • Restate the hypothesis • Did you follow the procedures exactly? Why or why not? • What did the data show? • Was the hypothesis correct? Why or why not? • What did you learn? Connect it to passive transport.

43. Conclusion • Restate the hypothesis • Did you follow the procedures exactly? Why or why not? • What did the data show? • Was the hypothesis correct? Why or why not? • What did you learn? Connect it to passive transport.

44. Osmosis Notes (pg 24) • Copy the definition of osmosis below. • Color the osmosis picture. • Glue it into your notebook. Osmosis: the movement of water from a high water concentration to a low water concentration

45. To Do...