Cell transport cell membrane key 1

University: Georgia Southern University

Course: Cell Biology (BIOL 5131)

Biology 102 Name _______________________ No. ___

Chapter 7

Date _____________ Class ____

Cell Transport WebQuest – Follow the directions to the websites and answer the questions about cell

membranes and cell transport.

http://nhscience.lonestar.edu/biol//bio1int.htm

At the top of the page, click “Cell Transport”. Then, click on Construction of the Cell Membrane.

Continue through the animation, reading the information and answering the questions below.

1. What is the cell membrane mainly composed of? __lipids and proteins_______________________

2. What are 5 types of molecules in the cell membrane? ___Phospholipids,___Fibrous Protein_____

____Glycoprotein,_Pore Protein_and_Channel Protein_______________

3. Name 3 lipid soluble, (fat soluble) substances that can pass through the plasma membrane. ________

____oxygen, carbon dioxide and steroids_________________________________________

4. What TYPE of substances need the help of proteins to pass through the plasma membrane? ________

_____water soluble substances_____________________________________________

5. Cholesterol is only found in __animal _ __________ cell membranes.

Click the Back button on the toolbar to return to the index page.

Now Click on Passive and Active Transport. This animation is like a short movie. Watch each section

FIRST, then try to answer the questions. When the navigation bar at the bottom turns yellow, it will pause

and you have to press the Next button.

Choose “Passive Transport” first.

1. Does passive transport require energy? __no_______

2. The 3 types of passive transport that you will be viewing are __simple diffusion; facilitated diffusion;

and osmosis_________________________________

3. In which direction do molecules move in diffusion? from _high_ concentration to _low_ concentration

4. When does diffusion end? __when equilibrium is reached__________

5. What is the difference between diffusion and facilitated diffusion? _facilitated diffusion uses proteins

6. What is the difference between diffusion and osmosis? _osmosis refers to the diffusion of water___

7. If the inside of the cell membrane is hypotonic to the outside, which is hypertonic, water will travel

across the cell membrane toward the ___outside__ side until _equilibrium_ is reached.

8. This is one way in which a cell maintains __homeostasis__. (hint: one of Mrs. Epps favorite words!)

9. What is the difference between active and passive transport? ___active transport requires energy__

10. Why is active transport necessary?cells often require substances that are rare in theirenvironment_

11. Describe what is happening in the ion pump animation. __ATP is used to pump H +

ion against the

concentration gradient ________

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