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Life Science Jones Name: Period: Date: Video: Cell Membranes: The Boundaries of Life 1. What is the smallest unit of life? __________ 2. What is another name for the cell membrane? 3. What controls the passage of materials into the cell from the external environment? 4. What is the current model of the cell membrane called? 5. What molecule builds the bi-layer of the cell membrane? 6. What does hydrophilic mean? 7. What part of the phospholipid hydrophilic? 8. What does hydrophobic mean? 9. What part of the phospholipid is hydrophobic? 10. Which part of the phospholipid faces the water on the inside and outside of the cell? 11. Which part of the phospholipid faces away from the water inside and outside of the cell? 12. What is the role of cholesterol in the cell membrane? 13. What molecule is embedded in the phospholipid bi-layer? 14. In general, what is the role of proteins in the phospholipid bi-layer? 15. The movement of molecules from an area of __________ concentration to an area of _______ concentration is called _________________. 16. When the cell takes no energy to move molecules into or out of a cell without energy is called ________________________________. 17. How do oxygen and carbon dioxide get into a cell? 18. How do ions, amino acids, and proteins (things that are large and/or charged) get into a cell? 19. What is the flow of water across the membrane called? 20. What is the name of a solution that will cause water to leave a cell? 21. What happens to the cell in this type of solution? 22. What is the name of a solution that will cause water to move into of a cell? 23. What happens to a cell in this type of solution?