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Cell Membrane Questions 1. Cells must stay in balance with their environment. What is this balance called? 2. Which part of the cell is selectively permeable, allowing only certain things in and out, in order to maintain this balance? 3. Give a creative example of diffusion. 4. What happens to plant cells when they do not have enough water? Why? 5. If there is more water in the soil and less in a plant’s roots, which way will the water move? What is this process called? 6. Within which organelle is water stored in a plant cell? 7. Glucose molecules are too large to enter the cell by themselves. Cells also usually like to “stockpile” sugar molecules for later. What process would the cell use to import glucose molecules? Explain why you think this way. 8. Give an example of active transport found in plants. 9. Which human cell performs endocytosis? 10. What are two differences between passive and active transport? 11. What is the difference between osmosis and diffusion? 12. What is the difference between endocytosis and exocytosis? 13. Define concentration. 14. After proteins are made by the ribosomes, how do they leave the cell?