Name _______________________________________ Date: ___________ Period ____ Unique # ____
Cell Membrane Webquest
Part 1 “ Cell Membrane" http://www.wisc-online.com/objects/index_tj.asp?objID=AP1101
Step through the animation once to get an overview of a cell membrane.
Draw a cell membrane and label all the parts as you step through the animation a second time
Part 2 - “ Components of a Cell Membrane" http://www.biologymad.com/cells/cellmembrane.htm
1. Name the three organic compounds that make up the cell membrane.
______________________ ______________________ _____________________
Lipids
2. How are phospholipids arranged?
3. The _______ layer acts as a barrier to __________molecules.
4. Animal cell membranes contain _______________linking the fatty acids together and so stabilizing and
strengthening the membrane.
1. Proteins
______________ proteins usually span from one side of the phospholipid bilayer to the other (integral
proteins)
2. ______________ proteins sit on one the surfaces of the cell membrane.
3. Proteins comprise about ______ of the mass of membranes, and are responsible for most of the
membrane's properties.
4. _______________ proteins that span the membrane are usually involved in transporting substances
across the membrane.
5. ________________proteins are often attached to the cytoskeleton and are involved in maintaining the
cell's shape, or in cell motility. They may also be enzymes, catalysing reactions in the cytoplasm.
Carbohydrates
1. Where are carbohydrates found in eukaryotic cell membranes?
2.
3.
4.
5.
6.
Proteins with carbohydrates attached are called __________________.
Phospholipids with carbohydrates attached are called glycolipids.
Carbohydrates are short polysaccharides composed of different ____________________ .
and form a ________________ outside the cell membrane.
What are the functions of the glycocalyx?
Name _______________________________________ Date: ___________ Period ____ Unique # ____
Part 3 - Diffusion and Osmosis http://www.mun.ca/biology/Osmosis_Diffusion/tutor2.html
1. Read the overview and define all the terms
Diffusion & Osmosis –
Passive Transport Thermal Motion Concentration Gradients Solutions Biological Membranes Scroll down to example #1 (how perfume spreads throughout a room) and read it.
Next scroll down to example #2 (salt dissolving in water) and read it.
Next scroll down to example #3 (diffusion will occur through a permeable membrane)
2. What is the solute concentration in side A? ____________________________________
What is the solvent concentration in side A? ____________________________________
3. What is the solute concentration in side B? _____________________________________
What is the solvent concentration in side B? ____________________________________
4. Draw a diagram of the two sides (A and B) and show the movement of solute and solvent
across the permeable membrane. Label the concentrations of solute and solvent under both
sides.
Name _______________________________________ Date: ___________ Period ____ Unique # ____
Part 4 Osmosis http://www.biologycorner.com/bio1/diffusion.html#
1. What is equilibrium?
2. What is a selectively permeable membrane?
3. What is Osmosis? _______________________________________
4. 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 a cell when it is placed in an isotonic solution? _____________
What does iso mean?____________________________
5. What does hypo mean?___________________________
A hypotonic solution has a _________________concentration of _______________ relative to
another solution like the cytoplasm of the cell.
What happens to a cell when it is placed in a hypotonic solution?
Which way does the water move? ___________________________
What happens to the cell? _________________________________
6. What does hyper mean?___________________________
A hypertonic solution has a _______concentration of _________ relative to another solution
like the cytoplasm of the cell
What happens to a cell when it is placed in a hypertonic solution?
Which way does the water move? _____________________________
What happens to the cell? __________________________________
Part 5 Phagocytosis
http://www.stolaf.edu/people/giannini/flashanimat/cellstructures/phagocitosis.swf
Run the animation of phagocytosis.
1. Phagocytosis involves bringing a large particle into the cell. Rerun the animation and describe the
process? Draw a diagram to help with your explanation
2. Do you think this activity would require energy? _________
3. From your knowledge of the cell in the last unit what is the energy molecule that would be needed
to carry out phagocytosis? ___________________________________
4. What organelle do you think digests the incoming particle? __________________________