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Transcript
Answer Key Section 3.3 Study Guide 1. Student should draw and label: phosphate group; glycerol; fatty acid. emphasizes both the fluidity of the membrane and the variety of molecules that make up the membrane. 17. selective permeability 2. the charged phosphate and glycerol 3. the fatty acid tails 4. polar 5. outside the cell because of the extracellular fluid and inside the cell because of the cytoplasm 6. The polar heads interact with the watery environments both inside and outside the cell. The nonpolar tails interact with each other inside the membrane. Copyright by McDougal Littell, a division of Houghton Mifflin Company 7. strengthen the cell membrane 8. help materials cross the membrane, part of the cytoskeleton 9. help identify cell types 10. The phospholipids in each layer can move from side to side and slide past each other. 11. Refer to Figure 3.18 for visual answer. 12. 13. 14. 15. receptor ligand intracellular membrane, changes 16. The fluid mosaic model is a description of the arrangement of the molecules that make up a cell membrane. It Answer Key 1
