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Crossing The Membrane Worksheet Name ______________________________ Answer each question using a complete sentence. 1. What are three methods of crossing the cell membrane require no work/energy? __________________ ______________________ ______________________ 2. What is a concentration gradient? _____________________________________________________________________________________________ _____________________________________________________________________________________________ 3. When does diffusion stop? __________________________________________________________________________________ __________________________________________________________________________________ 4. A cell already has a high concentration of sodium ions in its cytoplasm. What method of transport can it use to pump even more sodium ions inward? ______________________________________ 5. Sketch a white blood cell performing endocytosis to destroy a salmonella bacterium. Make three panels, one before, one during, and one after. 6. Sketch a salivary gland cell secreting vesicles of saliva into the environment using exocytosis. Make three panels, one before, one during, and one after. 7. Explain how carrier proteins function during facilitated diffusion. ___________________________________________________________________________________________________ ___________________________________________________________________________________________________ 8. Explain how carrier proteins function during active transport. ___________________________________________________________________________________________________ ___________________________________________________________________________________________________ 9. What is the difference between diffusion and osmosis? _____________________________________________________________________________________________ _____________________________________________________________________________________________ 10. Explain how the cell membrane is semipermeable. _____________________________________________________________________________________________ _____________________________________________________________________________________________ 11. Explain how a diffusion gradient allows a dog to follow a scent-trail to catch an animal. _____________________________________________________________________________________________ _____________________________________________________________________________________________