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In & Out of the Cell: Web Quest (Cell Transport)
Part 1 – Cell Membrane
GO TO THIS WEBSITE:
http://www.wiley.com/legacy/college/boyer/0470003790/animations/me
mbrane_transport/membrane_transport.htm
1. Read the “Overview” of a cell membrane. Click on “Continue” to observe
the animation. Draw a cell membrane and label all the parts as you step
through the animation.
2. Click “Continue” again to observe “Osmosis and Diffusion”. Why does the
balloon on the left get larger?
3. Click “Continue” to observe “Passive Transport”. NOTE: Osmosis and
diffusion are forms of passive transport. This animation describes a special
case of passive transport called facilitated diffusion. Larger molecules such as
glucose can then enter the cell by means of a special pathway. List the 3 steps
of how molecules like glucose get into the cell.
4. Click on “Continue” to observe “Active Transport”:
a. In what kind of cells is this “sodium-potassium pump” commonly found?
__________
b. What form of chemical energy is required for active transport to take place?
__________
b. What ion is moved into the cell? _____________ How many? __________
c. What ion is moved out of the cell? ______________ How many? __________
Part 2 – Construction of a Cell Membrane
http://www.wisc-online.com/objects/index_tj.asp?objID=ap1101
Click through to page 4:
1. Name the 3 globular-shaped proteins that make up part of the cell
membrane. ________________
________________
________________
2. Most of the cell membrane is made up of phospo ____________.
3. The “tails” are __________________ and therefore face inward and away
from water.
4. The “heads” are ________________ and face toward the water.
5. The “heads” and “tails” are arranged in a _______________ bilayer.
6. The fibrous proteins serve as _____________________________________
7. One type of _________________________ allows water to pass through.
8. Integral (channel) proteins transport ________________ for the cell.
9. ___________________ is found only in animal cells. It stabilizes the cell
membrane as well as making less permeable to water soluble substances.
Now, construct a Cell Membrane by answering questions one through ten in the
computer based activity.
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.
Part 4 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? __________________________________
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 the cell? ___________________________________
* The fluid that surrounds the ___________________ is isotonic.
Part 5 Diffusion and Osmosis
http://www.mun.ca/biology/Osmosis_Diffusion/tutor2.html
1. Read the overview and define all the terms by clicking on them:
• Diffusion –
• Passive Transport –
• Concentration Gradients –
 Now, click the back button…
 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) AND ANSWER THE FOLLOWING QUESTIONS:
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. Fill in the diagram below 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. Then answer the related questions:
Solute
A
Solvent
B
Solute diffuses from
side ____ to side ____
A
B
Solvent diffuses from
side ____ to side ____