Membrane Transport WebQuest (From Burlingame High School)

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Name _____________________________________Date_______________Period________


In & Out of the Cell (cell transport) Web Quest

All website links can be found on the In & out of cells page of BHS Biology

Part 1 “ Cell Membrane"

 http://home.earthlink.net/%7eshalpine/anim/Life/memb.htm

Step through the animation once to get an overview of a cell membrane.
Draw a cell membrane and label all the parts as you step through the animation a second time
Part 2

“ Components of a Cell Membrane"

http://telstar.ote.cmu.edu/Hughes/tutorial/cellmembranes/


The structure & function of cell membranes
1. Name the three organic compounds that make up the cell membrane.
______________________ ______________________ _____________________
The structure lipids
2. What is the relationship between lipids and water? ____________________________________
3. Name the 3 classes of lipids.
_______________________ _________________________ _______________________
Scroll down to phospholipids
4. Draw a phospholipid (you can also use the drawing from the part 1 diagram as a reference) &
label the parts.



Continue Part 2
5. Each phospholipid has a phosphate group. Does it have a charge? ________________________
If so what is it? ________________________________
6. Is the phosphate group attracted to water (hydrophilic) or is it repelled by water (hydrophobic)?
_______________________________________________________
7. Are the tails of phospholipids attracted to water (hydrophilic) or are they repelled by water
(hydrophobic)? _______________________________________________
8. Run the animation of a phospholipid layer. Diagram how these molecules organize in water.
9. Run the animation of inside the cell. Diagram the phospholipid bilayer in the cell membrane.

Steroids

10. What is the function of cholesterol in the cell membrane? __________________________
Scroll down to the fluidity of cell membrane animation.
11. After watching the animation describe what is meant by the fluidity of the cell membrane.
__________________________________________________________________________________
__________________________________________________________________________________


Part 3 Solutions

http://www.chem4kids.com/files/matter_solution.html


1. What is a solution?
2. Explain the difference between the solute and solvent.


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Part 4

Diffusion and Osmosis

http://www.mun.ca/biology/Osmosis_Diffusion/tutor2.html


1. Read the overview and define all the terms

Diffusion & Osmosis -
Passive Transport -
Thermal Motion -
Concentration Gradients -
Solutions -
Biological Membranes -
Scroll down to example #1 (how perfume spreads throughout a room) and read it.
Next scroll down to example #2 (salt dissolving in water) and read it.
Next scroll down to example #3 (diffusion will occur through a permeable membrane)
2. What is the solute concentration in side A? ____________________________________
What is the solvent concentration in side A? ____________________________________
3. What is the solute concentration in side B? _____________________________________
What is the solvent concentration in side B? ____________________________________
4. Draw a diagram of the two sides (A and B) and show the movement of solute and solvent
across the permeable membrane. Label the concentrations of solute and solvent under both
sides.


Part 5 Osmosis

http://www.tvdsb.on.ca/westmin/science/sbi3a1/Cells/Osmosis.htm


1. What is Osmosis? _______________________________________
2. A hypertonic solution has a _______concentration of _________ relative to another solution
like the cytoplasm of the cell
3. What happens to a cell when it is placed in a hypertonic solution? (Run the animation)
Which way does the water move? _____________________________
What happens to the cell? __________________________________


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4. A hypotonic solution has a _________________concentration of _______________ relative to
another solution like the cytoplasm of the cell.
5. What happens to a cell when it is placed in a hypotonic solution? (Run the animation)
Which way does the water move? ___________________________
What happens to the cell? _________________________________
6. An isotonic solution has the _____________ concentration of _______________ as another
solution like the cytoplasm of the cell.
Which way does the water move? ________________________________
What happens to a cell when it is placed in an isotonic solution? _____________


Part 6  Phagocytosis

http://www.stolaf.edu/people/giannini/flashanimat/cellstructures/cell.swf


Run the animation of phagocytosis.
1. Phagocytosis involves bringing a large particle into the cell. Rerun the animation and describe the
process? Draw a diagram to help with your explanation
2. Do you think this activity would require energy? _________
3. From your knowledge of the cell in the last unit what is the energy molecule that would be needed
to carry out phagocytosis? ___________________________________
4. What organelle do you think digests the incoming particle? __________________________