Study Guide: Exchanging Materials with the Environment (Cell

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					            Study Guide: Exchanging Materials with the Environment (Cell Membranes)
            Chapter 3

            1.  Why are you at the mercy of your phospholipid bilayer?
            2.  What causes chemical to cross the phospholipid bilayer?
            3.  What are the permeability rules for the phospholipid bilayer?
            4.  >(Know how molecule size, polarity, and electric charge affects its ability to pass
                through a membrane.)
                >Describe, compare and contrast the different mechanisms by which chemicals
                pass through membranes.
            5. Know the concept of Homeostasis and how membranes regulate the type and
                amount of chemicals that enter the cell.
            6. Compare Osmosis and Diffusion
            7. Understand the term: “Semipermeable” membrane
            8. Know the relationship between monomers, polymers, and molecule size.
            9. Describe “Passive Transport” in terms of energy and types of molecules that pass
                through a membrane
            10. Describe “Active Transport” in terms of energy and types and sizes of molecule
                that pass through a membrane.
            11. Describe how semi-permeable membranes and diffusion interact to change the
                size and turgor pressure of cells.
            12. Explain isotonic, hypotonic, and hypertonic solutions and how they affect cell
                size.
            13. Complete the Diffusion Worksheet

            Vocabulary
            1. Homeostasis                  10. Active Transport              19. Solution
            2. Cytoplasm                    11. Passive Transport             20. Dissolve
            3. Permeable                    12. Facilitated Diffusion         21. Plasma Membrane
            4. Semi-Permeable               13. Endocytosis                   22. Glycoproteins
            5. Impermeable                  14. Exocytosis                    23. Glycolipids
            6. Selectively Permeable        15. Turgor                        24. Hydrophobic
            7. Concentration Gradient       16. Isotonic                      25. Hydrophilic
            8. Osmosis                      17. Hypotonic                     26. Polar Molecules
            9. Diffusion                    18. Hypertonic                    27. Non-Polar molecules


                                            How does It Pass      Active or
Molecule                    Concentration                                                  Diffusion, Facilitated
                 Examples                     Through the          Passive     Uses ATP?
 Type                         Gradient                                                     Diffusion, or Osmosis
                                              Membrane?           Transport

                             High to Low
  Ions
                             Low to High

Monomers                     High to Low

                             Low to High
 Small,
  Polar                      High to Low
Molecules
                             Low to High
 Small,
                             High to Low
Non-Polar
Molecules
                             Low to High

 Large
Polymers

				
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