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Transcript
Name ______________________________ Class ___________________ Date __________________ Skills Worksheet Directed Reading 8.1 Section: Cell Membrane Read each question, and write your answer in the space provided. 1. What is homeostasis, and what is the main way that the cell membrane helps maintain homeostasis? _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 2. List three other functions of the cell membrane. _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ Complete each statement by writing the correct term or phrase in the space provided. 3. The ______________________ ______________________ is made of a double layer of phospholipids. The double layer of phospholipids is called a(n) ______________________ ______________________. 4. The lipid bilayer forms because there is ______________________ both inside and ______________________ of the cell. 5. The phosphate ______________________ of a phospholipid is polar. It is ______________________ ______________________ water. 6. The long fatty acid ______________________ of a phospholipid are nonpolar. They are ______________________ ______________________ water. 7. The lipid bilayer forms a barrier, preventing most molecules from passing through it. Only molecules that are ______________________ in size and ______________________ can pass through the lipid bilayer. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Biology 1 Cells and Their Environment Name ______________________________ Class ___________________ Date __________________ Directed Reading continued 8. Ions, which are ______________________ particles, and ______________________ molecules are repelled by the nonpolar interior of the lipid bilayer. 9. The cell membrane includes various kinds of ______________________. Some face the inside of the cell. Some face the ______________________ of the cell. Others span the entire width of the ______________________ ______________________. Read each question, and write your answer in the space provided. 10. What are proteins made of? ________________________________________ 11. Why do proteins stay within the lipid bilayer of the cell membrane? _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 12. List the four types of proteins found in a cell membrane. _______________________________________________________________ _______________________________________________________________ In the space provided, write the letter of the description that best matches each term. a. helps with chemical reactions inside the cell b. recognizes and binds to substances outside the cell, enabling the cell to sense its environment c. helps substances move across the cell membrane d. identifies the cell type _____ 13. cell-surface marker _____ 14. receptor protein _____ 15. enzyme _____ 16. transport protein Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Biology 2 Cells and Their Environment