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WEBQUEST: Cell Transport
In this webquest, you will be visiting various websites that will demonstrate the different types of passive and active transport utilized by cells.
SITE #1: Cell Transport Overview and Membranes
http://www.wiley.com/legacy/college/boyer/0470003790/animations/membrane_transport/membra ne_transport.htm
What is meant by cellular transport?
What important substance must red blood cells be able to take up or release?
Press “continue” or select “membrane” from left side of the page
What is cell membrane primarily composed of?
Which two general characteristics will prevent a molecule from being able to pass through the cell membrane? &
SITE #2: Online Textbook Diffusion Tutorial http://highered.mheducation.com/sites/0072495855/student_view0/chapter2/animation__how_diff usion_works.html
Click on “PLAY” and watch / listen to the animation. NOTE : If you have them, plug in headphones. Otherwise, simply read the text & watch the animation.
Take the 5-question quiz underneath the animation screen & submit your answers!
Answer the following questions:
In terms of molecules and molecular motion, explain what happens to a sugar cube when it is placed into a beaker of water.
Define DIFFUSION.
Identify 3 factors that affect the rate of diffusion.
A) B) C)
- PREDICT : what would happen if you drop the sugar cube into a beaker of hot water vs. into a beaker of cold water
SITE #3 - Facilitated Diffusion Tutorial http://highered.mheducation.com/sites/0072495855/student_view0/chapter2/animation__how_faci litated_diffusion_works.html
Click on “PLAY” and watch / listen to the animation. NOTE : If you have them, plug in headphones. Otherwise, simply read the text & watch the animation.
Take the 5-question quiz underneath the animation screen & submit your answers!
Answer the following questions:
What is facilitated diffusion?
Explain what it means to say these protein channels are selective in terms of what they allow into or out of the cell.
Facilitated diffusion involves the movement of particles (with / against) the concentration gradient. (CIRCLE the correct answer).
a) In what ways are simple diffusion and facilitated diffusion the same?
b) How are they different?
SITE #4 – Online Textbook Osmosis Tutorial http://highered.mheducation.com/sites/0072495855/student_view0/chapter2/animation__how_os mosis_works.html
Click on “PLAY” and watch / listen to the animation. NOTE : If you have them, plug in headphones. Otherwise, simply read the text & watch the animation.
Take the 5-question quiz underneath the animation screen & submit your answers!
Answer the following questions:
- Most molecules cannot freely cross the cell membrane. Is this true for
water molecules?
Define OSMOSIS :
In the animation, urea is added to one side of the membrane. In which direction do water molecules move? WHY? (include the word “concentration” in your answer!)
CIRCLE the appropriate word for each statement:
The solution with (higher / lower) solutes is HYPERTONIC.
The solution with (higher / lower) solutes is HYPOTONIC.
What is ENDOCYTOSIS?
Give two examples of endocytosis.
A) B)
Continue the animation. Read the section “Exocytosis.” You may have to press pause in order to read the entire section.
What is EXOCYTOSIS?
What are 2 things that can be moved out of the cell using exocytosis.
A) B)
SITE #7 - Endocytosis and Exocytosis http://highered.mheducation.com/olcweb/cgi/pluginpop.cgi?it=swf::535::535::/sites/dl/free/ 7316/120068/bio02.swf::Endocytosis%20and%20Exocytosis
Draw and summarize ENDOCYTOSIS :
Beginning Middle End
Draw and summarize EXOCYTOSIS :
Beginning Middle End
