CELL TRANSPORT TEST STUDY GUIDE FOR ESSAYS Two or three of these essays will be on the test: 1. a) What is a contractile vacuole? Why do Paramecium and other freshwater unicellular organisms need them? b) Do unicellular salt water organisms need contractile vacuoles? Explain. 2. Explain why you can not drink salt water. 3. A cell uses materials as it need them. How does this influence the direction of diffusion? 4. Explain what happens to roadside plants when snow melts and mixes with road salt. 5. In as much detail as possible explain why the aroma of cooking food (like bacon!) spreads throughout a room. 6. What is turgor pressure? How is turgor pressure created and why is it important to plants? 7. Why do molecules diffuse from high to low concentrations? Explain in as much detail as possible.
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