CELL MEMBRANE & CELL TRANSPORT WEBQUEST
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W ebsite: http://www.wisc-online.com/objects/index_tj.asp?objID=AP1101
1. What are the TWO MAIN COMPONENTS that make up the CELL MEMBRANE?
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2. What types of molecules can EASILY go through your cell membrane or are PERMEABLE to the
cell membrane?
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3. What types of molecules CANNOT easily go through your cell membrane?
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4. DRAW THE PHOSPHOLIPID BILAYER of the CELL MEMBRANE, labeling the
HYDROPHILIC HEADS and HYDROPHOBIC TAILS.
5. TRUE OR FALSE: In addition to lipids and proteins, you can also find CARBOHYDRATES in the
cell membrane.
6. What is the FUNCTION of the carbohydrates within the cell membrane?
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7. In the illustration below, label which type of transport is shown: facilitated diffusion or active
transport.
8. Fill in the blanks in the following table:
Molecule Method of Transport Water
Osmosis
Large,
Uncharged
Passive or Active? Passive
Direction of Movement Description down a concentration gradient
movement of water from high to
low concentration
down a concentration gradient
requires a protein embedded
within the cell membrane
Large, Charged
(ions)
Endocytosis
up a concentration gradient
requires energy to move
molecules into the cell
Large, Charged
(ions)
Exocytosis
up a concentration gradient
requires energy to move
molecules out of the cell
down a concentration gradient
movement of any substance from
high to low concentration
Small,
Uncharged
Passive
CELL MEMBRANE & CELL TRANSPORT WEBQUEST
**Website:
http://programs.northlandcollege.edu/biology/Biology1111/animations/transport1.html
Select PASSIVE TRANSPORT
9. Define PASSIVE TRANSPORT:
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10. What are three types of PASSIVE TRANSPORT?
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PRESS “NEXT”
11. What is the function of INTERGRAL PROTEINS? ____________________________________________________________________________________________________
12. Cell Membranes are said to be SEMIPERMEABLE, what does that mean?
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PRESS “NEXT”
13. Define diffusion.
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14. Define a CONCENTRATION GRADIENT:
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15. ILLUSTRATE a “before” and “after” example of diffusion across a cell membrane:
BEFORE
AFTER
16. Identify THREE factors that can have an affect on the RATE of DIFFUSION:
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17. What is meant by the term EQUILIBRIUM?
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18. DRAW a PICTURE showing a CELL that is IN EQUILIBRIUM with its environment:
PRESS “NEXT”
19. Define facilitated diffusion:
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20. Does facilitated diffusion require energy for the cell? _________
21. What molecules within the cell membrane play a VITAL ROLE in FACILITATED DIFFUSION?
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CELL MEMBRANE & CELL TRANSPORT WEBQUEST
PRESS “NEXT”
22. Define osmosis:
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23. Draw a BEFORE and AFTER for a cell in a HYPOTONIC solution. Show the change in size of
the cell.
24. Draw a BEFORE and AFTER for a cell in a HYPERTONIC solution. Show the change in size of
the cell.
**WEBSITE:
http://www.vivo.colostate.edu/hbooks/cmb/cells/pmemb/osmosis.html
Scroll down to “The classic demonstration of osmosis and osmotic pressure is to immerse red blood cells
in solutions of varying osmolarity and watch what happens.”
25. DRAW what a Red Blood Cell would look like in an ISOTONIC SOLUTION.
26. DRAW what a Red Blood Cell would look like in a HYPERTONIC
SOLUTION.
27. DRAW what a Red Blood Cell would look like in a HYPOTONIC
SOLUTION.
**WEBSITE:
http://www.indiana.edu/~phys215/lecture/lecnotes/Old%20Files/diff.html
28. Diffusion ALWAYS goes from ______________concentration to __________________concentration
and DOES or DOES NOT require energy in the form of ATP.
29. At the beginning of the animation, where are there more particles?
__________________
30. Are the particles moving in only one direction, or are they moving in both directions? _____________
31. Watch the animation until it reaches NO NET FLOW. How many particles are on each side of the
membrane? _______
32. When there is NO NET FLOW the cell is said to reach what?
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CELL MEMBRANE & CELL TRANSPORT WEBQUEST
**WEBSITE #5: http://nhscience.lonestar.edu/biol/osotutor.html
33. EXPLAIN why food-coloring particles are FIRST condensed into a single drop, but after revisiting
the cup of water several minutes later, the entire cup of water is colored.
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CLICK ON ANIMAL CELL MEMBRANE TUTORIAL – Animal Cell Membrane Tutorial - Page 1 of 3
34. The plasma is a(an)_____________solution to the solution in the red blood cell.
35. The diffusion of water(osmosis) into the cell is _________the diffusion of water(osmosis)out of the
cell.
36. The turgor pressure of the RBC is _________zero.
37. The pressure on the inside of the cell is ___________ the pressure on the outside.
NOW, CLICK ON “NEXT” at the BOTTOM of the page – Animal Cell Membrane Tutorial - Page 2 of 3
38. This red blood cell can now be described as being ________________.
39. The % concentration of water in the cell was _____________the % concentration of water in the salt
solution. 40. Thus the net direction of osmosis was ______________ the red blood cell.
41. The salt solution was _______________ relative to the red blood cell.
NOW, CLICK ON “NEXT” at the BOTTOM of the page. – Animal Cell Membrane Tutorial - Page 3 of 3
42. This red blood cell can now be described as being________________.
43. The distilled water was _________________ relative to the cell.
44. The cell was ________________ relative to the distilled water.
45. The direction of net osmosis was __________________ the cell.
EXTRA CREDIT (3 points): Explain what is happening in this cartoon.