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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”
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3. What types of cells have cell membrane? ____________________________________
4. What exactly is a cell membrane? _______________________________________________________________________
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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? _____________________________________________________
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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?] __________________________
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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?”]
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17. What does it mean to be “selectively permeable?” [Hint: Can ALL things get through?]
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18. The cell membrane is like a _______________ at a club because it ____________________________________________
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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: _____________________________________________________________________________________________
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2nd thing: _____________________________________________________________________________________________
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3rd thing: _____________________________________________________________________________________________
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#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.”