Internet Lab: Cell Structure and Function

Internet Lab: Membrane Transport

You can find the Word file of this document from our course website, Go to: www.teacherweb.com/CA/Kennedy/Kreiselman Go to: “Honors Biology Files”. Click on: “Internet Lab – Membrane Transport”

General Instructions: There are few optional ways to get to the websites that are listed below. A. Type in the full address in the address window at the top. (Easy to make mistakes!) B. Open the handout file and clicking on the links to open them (will take you out of the file, and will delay you coming back to the file.) – most recommended. C. Open the handout file from the course website, copy and paste the address into the address window at the top. D. Saving the file and opening the websites with the right mouse. This is only possible if you have your own USB drive.

Membrane Structure and Transport Introduction: So far you have learned that the cell membrane defines the border line of the cell, and as such is a decision maker as to what can go into and out of the cell. By making the right decisions, the membrane is able to maintain steady internal conditions, and deliver messages between the interior of the cell to it surroundings. The question is – how does the seemingly simple lipid bilayer control so many processes? Step through this internet tutorial, and you are promised to find the answer! Once you will grasp the various types of transport, you will be able to explain how nerve cells transmit signals in the brain amongst others, how the heart is being controlled, what fishes do in order to survive in high salt or low salt concentrations, and more.

Animated Lesson about Passive and Active Transport.

Go to http://programs.northlandcollege.edu/biology/Biology1111/animations/transport1.h tml. Follow the directions step by step. Fill in what you have learned in the answer sheet.

Note: The transport mechanisms that are mentioned in this tutorial are also explained in other linked websites, which sometimes might be more clear for you to understand. These links are also listed below. Membrane Structure: - Animation: http://telstar.ote.cmu.edu/biology/downloads/membranes/index.html (Scroll down to animations shown in class) - Fluidity: http://www.stolaf.edu/people/giannini/flashanimat/lipids/membrane%20fluidity.swf - Building a virtual model of a membrane: http://www.zerobio.com/drag_gr11/memb.htm - Non-polar substances in water: http://www.indiana.edu/~oso/animations/water&oil.html

Diffusion: - Animation: http://www.stolaf.edu/people/giannini/flashanimat/transport/diffusion.swf - Simulation: http://lessons.harveyproject.org/development/general/diffusion/diffnomemb/diffno memb.html

Osmosis: - Animation: http://www.stolaf.edu/people/giannini/flashanimat/transport/osmosis.swf - Illustration: Osmosis in plant cells http://en.wikipedia.org/wiki/Image:Turgor_pressure_on_plant_cells_diagram.svg - Illustration: Effects on plant and animal cells http://kentsimmons.uwinnipeg.ca/cm1504/Image130.gif

Facilitated Diffusion: - Ion Channels, Gated Ion Channels - : http://www.stolaf.edu/people/giannini/flashanimat/transport/channel.swf - Carrier Proteins: http://www.stolaf.edu/people/giannini/flashanimat/transport/caryprot.swf

Active Transport / Protein Pumps: - Na+/K+ ATPase: - http://www.stolaf.edu/people/giannini/flashanimat/transport/atpase.swf - Symport (2 going with the same direction): http://www.stolaf.edu/people/giannini/flashanimat/transport/symport2.swf. - Antiport (2 going in opposite directions): http://www.stolaf.edu/people/giannini/flashanimat/transport/antiport.swf.

Endocytosis and Exocytosis:

-Animation: Exocytosis http://www.stanford.edu/group/Urchin/GIFS/exocyt.gif (just membrane fusion) Also see “Vesicular Transport”, next section - Animation – Phagocytosis: (a form of endocytosis): http://www.stolaf.edu/people/giannini/flashanimat/cellstructures/phagocitosis.swf