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