1. Objective: C3 – Identify the parts of the cell membrane including lipids, proteins, & carbohydrates and investigate & explain the transport of molecules through this membrane such as diffusion & osmosis Cell Boundaries

2. Chp. 7, Section 2 & 4 – Cell Boundaries Animal cellPlant cell Cell / Plasma Membrane Cell Wall – provides support & protection, usually made of tough fibers

3. Complex barrier separating the cell from it's external environment – Holding cytoplasm within cells – Regulating substances entering and exiting cells – Recognizing other cells Is arranged in a double layer called a Lipid Bilayer – Made up of Phospholipids (a phosphate group & 2 fatty acids) 1. The Cell Membrane

4. "Selectively Permeable" membrane that regulates (like a gate) what passes into and out of the cell

5. Cell Membranes are FLUID Lipids and Proteins of the Cell Membrane are always in motion 1. The Cell Membrane

6. Membrane Proteins – PROTEIN MOLECULES are EMBEDDED in the Lipid Bilayer – HELP to MOVE substances that are large or charged (ions) INTO and OUT of the Cell 1. The Cell Membrane

7. – Often have carbohydrates attached to them to serve as I.D. badges that allow cells to recognize each other 1. The Cell Membrane

8. Diffusion – Movement of particles from an area of high concentration to an area of low concentration (no energy required) Osmosis – Diffusion of water through a selectively permeable membrane 1. The Cell Membrane

9. 3 different types of Osmosis

10. Isotonic – The concentration of solutes is the same inside and outside the cell – Water moves in and out Hypertonic – Solution has a higher solute concentration than the cell – Water moves out Hypotonic – Solution has a lower solute concentration than the cell – Water moves in 3 different types of Osmosis

12. Facilitated Diffusion / Passive Transport – Uses proteins to move molecules through a cell membrane along the concentration gradient (no energy required) 1. The Cell Membrane

13. Active Transport – Uses proteins to move molecule against the concentration gradient – Requires energy 1. The Cell Membrane

14. Exocytosis and Endocytosis Exocytosis – process of a cell releasing materials Endocytosis – process of cell taking materials in Exocytosis

15. Animal cellPlant cell Cell / Plasma Membrane

16. Adiffusion Bfacilitated diffusion Cosmosis Dpassive transport Eactive transport Which cell process will move substances against a concentration gradient? [NC08 EOC] Requires ENERGY Practice Question

17. What cell membrane structure allows bigger molecules to cross over and also serves as an attachment site for the cytoskeleton? A.Carbohydrate B.Phospholipids C.Cholesterol D.Protein Practice Question

18. What kind of passive transport is shown in the picture? A. Diffusion B. Osmosis C. Facilitated diffusion D. Active transport