Cell Transport Webquest
Name:________________________________
Part 1 – Cell Membrane
GO TO THIS WEBSITE:
http://www.wiley.com/legacy/college/boyer/0470003790/animations/membrane_transport/membrane_transport.htm
Read the first page (OVERVIEW):
1. State two reasons why cell transport is so important.
A.
B.
2. What cells need oxygen? _______________Glucose?_________________________
3. Click on “Continue” to observe the animation. Draw a cell membrane and label all the parts as you
step through the animation.
4. What are the two main characteristics that determine whether a molecule can pass through the cell
membrane or not?
A.
B.
5. In the model with the two balloons, can the water get across the membrane? ________
6. Can the sugar (glucose) get across the membrane? ________
7. If there is a high sugar concentration in one solution, what is the concentration of water (high or
low)? _____________
8. If there is a low sugar concentration in the other solution, what is the concentration of water (high or
low)? _____________
9. Which way will the water tend to move (in terms of sugar concentration)? ___________
10. Which way will the water tend to move (in terms of water concentration)? __________
11. What happened to the two balloons? __________________________________________
12. Why are the two balloons different sizes?
_______________________________________________________________________________________________________________
13. What is the “aim” of osmosis? _______________________________________________
14. Click “Continue.” You will be on the page “PASSIVE TRANSPORT”. NOTE:
Larger molecules such as glucose can enter the cell by means of a special pathway. List the 3 steps of
how molecules like glucose get into the cell.
1.
2.
3.
15. Click “Continue.” You will be on the page “ACTIVE TRANSPORT”:
How are active transporters different from passive transporters – give two ways.
1.
2.
a. Which “pump” will you be looking at in this model?
b. In what kind of cells is this “sodium-potassium pump” commonly found? _______
c. What form of chemical energy is required for active transport to take place? _____
d. What ion is moved into the cell? _____________
e. What ion is moved out of the cell? ______________
f. Why do the pumps have to act continuously? ___________________________
Part 2 – Construction of a Cell Membrane
http://www.wisc-online.com/objects/index_tj.asp?objID=ap1101
Click through to page 4:
16. Name the 3 globular-shaped proteins that make up part of the cell membrane. ________________
________________ ________________
17. The “tails” are __________________ and therefore face inward and away from water.
18. The “heads” are ________________ and face toward the water.
19. The fibrous proteins serve as _____________________________________
20. One type of _________________________ allows water to pass through.
21. Integral (channel) proteins transport ________________ for the cell.
22. Glycoproteins _______________ a cell.
23. ___________________ is found only in animal cells. It stabilizes the cell membrane as well as making less
permeable to water soluble substances.
Part 3 Solutions
Go to: http://www.chem4kids.com/files/matter_solution.html
24. What is a solution?
25. Explain the difference between the solute and solvent.
Part 4 Osmosis
Go to: http://www.tvdsb.on.ca/westmin/science/sbi3a1/Cells/Osmosis.htm
26. What is osmosis? ______________________________________________
_____________________________________________________________
27. A hypertonic solution has a _______concentration of _________ relative to
another solution (like the cytoplasm of the cell).
28. 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? __________________________________
29. A hypotonic solution has a _________________concentration of
__________ relative to another solution (like the cytoplasm of the cell).
30. 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? _________________________________
31. 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
32. Read the overview and define all the terms by clicking on them:
• Diffusion –
• Passive Transport –
• Concentration Gradients –
Part 6 Exocytosis & Endocytosis
Go to:
http://highered.mcgrawhill.com/olcweb/cgi/pluginpop.cgi?it=swf::535::535::/sites/dl/free/0072437316/12006
8/bio02.swf::Endocytosis%20and%20Exocytosis
33. What type of substances are often taken in by cells? ____________________
Make sure the TEXT is showing at the bottom of your screen. If not, click “text” on the bottom right.
Then click: PLAY
34. Describe how a single-celled organism might take in food.
35. Describe the differences between the three type of endocytosis:
A. Phagocytosis
B. Pinocytosis
C. Receptor mediated endocytosis