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Transcript
NO EXCUSES! Name: ________________________________________ Date:______________ Period: _____ Assignment #: _____ Assignment # – Cell Membrane Structure Worksheet Vocabulary to keep in mind: Cell Membrane Nonpolar Phospholipid Semi-Permeable Embedded Protein Fluid-Mosaic Model Polar 2. Write 1 sentence that explains the relationship between “polymers” & “monomers” _____________________________________________________________________________________________________ _____________________________________________________________________________________________________ 3. What types of cells have cell membrane? ____________________________________ 4. What exactly is a cell membrane? _______________________________________________________________________ _____________________________________________________________________________________________________ 5. What are the two main roles of the cell membrane? 1st Job: and 2nd Job: 6. What type of polymer makes up most of the cell membrane?______________________________ 7. What THREE types of polymer make up most of the cell membrane? Answer: The cell membrane is mostly made of ______________, although there are some ________________ that help bring things into and out of the cell, and some ___________________ attached to the outside of the membrane to help with identification of the cell [communication]. 8. What is a phospholipid and where is it found in the cell? _____________________________________________________ _____________________________________________________________________________________________________ 9. What do we call the proteins that are stuck in the cell membrane? __________________________ 10. What function do the proteins that are stuck in the membrane serve? [what do they DO?] __________________________ _____________________________________________________________________________________________________ 11. Make a drawing of a PHOSPHOLIPID and label the “polar head” and the “nonpolar tails” Phospholipid Drawing: 12. If something is “polar”, does it like or hate water? __________ 13. What part of the phospholipid is “polar”? ________________ 13. If something is “nonpolar,” does it like or hate water? _______ 14. What part of the phospholipid is “nonpolar”? ______________ 15. Make a complete drawing of the cell membrane (look at Box#3 of your notes) and Label/COLOR the parts correctly: Phospholipid Polar HEAD: Red Phospholipid Nonpolar TAILS: Orange Embedded Proteins: Blue Carbohydrates: Green Drawing: Label and COLOR the correct parts. 16. Why does the cell membrane arrange into a BILAYER (double layer) of phospholipids, with the heads facing the outside and inside of the cell and the tails facing each other? [HINT: Think about which parts are “water-loving” and which parts are “water-hating?”] _____________________________________________________________________________________________________ _____________________________________________________________________________________________________ _____________________________________________________________________________________________________ 17. What does it mean to be “selectively permeable?” [Hint: Can ALL things get through?] _____________________________________________________________________________________________________ _____________________________________________________________________________________________________ _____________________________________________________________________________________________________ 18. The cell membrane is like a _______________ at a club because it ____________________________________________ _____________________________________________________________________________________________________ 19. Not everything can just pass through the cell membrane – some things can get in and out, while others can’t! What are some things that you see in the real world that are LIKE the cell membrane (some things can get through, but others just can’t do it!). WRITE EACH ONE DOWN AND GIVE A ONE-SENTENCE EXPLANATION! 1st thing: _____________________________________________________________________________________________ _____________________________________________________________________________________________________ 2nd thing: _____________________________________________________________________________________________ _____________________________________________________________________________________________________ 3rd thing: _____________________________________________________________________________________________ _____________________________________________________________________________________________________ #20-21: TRUE OR FALSE: If it is FALSE, you MUST explain why in the box below the statement!!!!!!!!!! 20. “Proteins makes-up most of the cell membrane, although there are some lipid doors that allow some molecules to enter .” 21. “The cell membrane is selectively permeable, which means that it lets things INTO the cell but not out of the cell.”