Membrane Transport WebQuest (From Burlingame High School)
In & Out of the Cell (cell
transport) Web Quest
All website links can be found on the In & out of cells page
of BHS Biology
Part 1 “ Cell Membrane"
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
“ Components of a Cell Membrane"
The structure & function of cell membranes
1. Name the three organic compounds that make up the cell membrane.
______________________ ______________________ _____________________
The structure lipids
2. What is the relationship between lipids and water?
3. Name the 3 classes of lipids.
Scroll down to phospholipids
4. Draw a phospholipid (you can also use the drawing from the part 1
diagram as a reference) &
label the parts.
Continue Part 2
5. Each phospholipid has a phosphate group. Does it have a charge?
If so what is it? ________________________________
6. Is the phosphate group attracted to water (hydrophilic) or is it
repelled by water (hydrophobic)?
7. Are the tails of phospholipids attracted to water (hydrophilic) or
are they repelled by water
8. Run the animation of a phospholipid layer. Diagram how these
molecules organize in water.
9. Run the animation of inside the cell. Diagram the phospholipid
bilayer in the cell membrane.
10. What is the function of cholesterol in the cell membrane?
Scroll down to the fluidity of cell membrane animation.
11. After watching the animation describe what is meant by the fluidity
of the cell membrane.
Part 3 Solutions
1. What is a solution?
2. Explain the difference between the solute and solvent.
Diffusion and Osmosis
1. Read the overview and define all the terms
Diffusion & Osmosis -
Passive Transport -
Thermal Motion -
Concentration Gradients -
Biological Membranes -
Scroll down to example #1 (how perfume spreads throughout a room) and
Next scroll down to example #2 (salt dissolving in water) and read it.
Next scroll down to example #3 (diffusion will occur through a
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
Part 5 Osmosis
1. What is Osmosis? _______________________________________
2. A hypertonic solution has a _______concentration of _________
relative to another solution
like the cytoplasm of the cell
3. What happens to a cell when it is placed in a hypertonic solution?
(Run the animation)
Which way does the water move? _____________________________
What happens to the cell? __________________________________
4. A hypotonic solution has a _________________concentration of
_______________ relative to
another solution like the cytoplasm of the cell.
5. What happens to a cell when it is placed in a hypotonic solution?
(Run the animation)
Which way does the water move? ___________________________
What happens to the cell? _________________________________
6. 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?
Part 6 Phagocytosis
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?