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Transcript
Name: _______________________________ Block: _______ Date: __________________
Cellular Transport Web Activity
Activity 1: Types of Transport
Log on to: http://www.teachersdomain.org/asset/tdc02_int_membraneweb/
Click on “Instructions” and read the paragraphs.
In order to maintain a stable environment or homeostasis, a cell must take in and let out certain
substances.
1. What does a cell need to take in to survive? ______________________________________________
___________________________________________________________________________________
2. What does a cell let out? _____________________________________________________________
3. Think: Provide an example of a substance that a cell would produce that other cells in the body would
need. _______________________________________
Click on “Interstitial Fluid” and read the paragraphs.
4. Circle the correct answer: Interstitial fluid could also be called extracellular fluid / intracellular fluid.
5. Circle the correct answer: Cytoplasm could also be called extracellular fluid / intracellular fluid.
Click on “Lipid Bilayer” and read the paragraphs.
6. The lipid bilayer is the major component of the plasma or cell membrane. What two characteristics of a
molecule would NOT let it pass through the lipid bilayer easily? _________________________________
___________________________________________________________________________________
Click on “Plasma Membrane” and read the paragraphs.
7. Describe the three ways substances can enter or exit the cell. ________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
Click on “Protein Pump” and read the paragraphs.
8. What kind of cell transport does a protein pump perform? ___________________________________
9. What does a protein pump require in order to move substances? _____________________________
Click on “GluT Transporter” and read the paragraphs.
10. Describe how the process of facilitated diffusion works. ____________________________________
___________________________________________________________________________________
To fill out the table below, click on the different types of molecules, watch the animations, and
read the paragraphs. Answer the additional questions that follow.
Molecule
Direction of
Molecule
Movement
(High to Low
Concentration or
Low to High
Concentration)
Energy
Required for
Movement
(Yes or No)
Part of Cell
Through Which
Molecule Passes
(Lipid Bilayer,
Membrane Protein,
or Vesicles)
Type of
Transport
Oxygen
Carbon Dioxide
Diffusion
Glucose
Sodium
Membrane Protein
Low  High
Water
Enzyme
Yes
11. What is the relationship between oxygen, carbon dioxide, and glucose? _______________________
___________________________________________________________________________________
___________________________________________________________________________________
12. What is exocytosis? Besides enzymes, what other substance is transported through exocytosis?
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
Activity 2: Movement Across a Membrane
Log on to: http://tinyurl.com/nhem29z
Directions: Read through the website and conduct the activity by following the instructions. (Typically you
press the red dot to advance the activity.) Answer the questions on this paper as you move through the
activity.
What did you place INSIDE the dialysis bag? _______________________________________________
What did you place in the beaker OUTSIDE of the dialysis bag? ________________________________
___________________________________________________________________________________
The following table describes the indicators that are used to test for different substances.
Test
IKI (iodine) test for starch
Positive Result
dark blue/purple/black solution
Negative Result
no color change or amber solution
Barium chloride (BaCl2) test for
sulfate(SO4) ions
Silver nitrate (AgNO3) test for
chloride (Cl-)ions
Biuret test for protein
milky or cloudy white precipitate
formed
milky or cloudy white precipitate
formed
light purple solution
no color change or no precipitate
no color change or no precipitate
no color change or light blue
solution
Enter “+” or “-“ for each test :
Results of Tests for Substances in Beaker
Initially
After incubation
Starch
Sulfate ion
Chloride ion
Protein
Results of Tests for Substances in Bag
Initially
After incubation
Starch
Sulfate ion
Chloride ion
Protein
Follow-up Questions:
1)
A.
B.
C.
D.
To which substances was the dialysis tubing permeable?
Starch/sulfate ion
Starch/protein
Chloride ion/sulfate ion
Protein/chloride ion
2) To which substances was the dialysis tubing impermeable?
A. Starch/sulfate ion
B. Starch/protein
C. Chloride ion/sulfate ion
D. Protein/chloride ion
3) Suggest a reason for the failure of some substances to diffuse through the membrane. Hint: The
chemical formula for sulfate is S04 and for starch (C6H10O5)700. __________________________________
___________________________________________________________________________________
4) Can different materials diffuse through a membrane in opposite directions at the same time? Support
your statement with evidence from your experiment. ___________________________________
___________________________________________________________________________________
___________________________________________________________________________________
5) In what way is the dialysis membrane like the cell membrane? _______________________________
___________________________________________________________________________________
___________________________________________________________________________________
6) In each case, the molecules moved from _____________________ concentration to
____________________ concentration.
7) Dialysis is a technique used to purify blood in cases of kidney failure. During dialysis, what substances
would you want to remove from the bloodstream? What substances would you want to remain in the
bloodstream? Hint: You may have to look up how dialysis works online.
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
Activity 3: Osmosis in Cells
Log on to:
http://www.phschool.com/science/biology_place/biocoach/biomembrane1/osmosis.html
Osmosis (movement of water across membranes) depends on the relative concentration of solute
molecules on either side of the membrane. The presence or absence of cell walls influences how cells
respond to osmotic fluctuations in their environment.
Click on Review
Looking at the diagram above, describe the difference between the three types of solutions.
The small circles represents dissolved solutes like salt, glucose, and amino acids. You can assume that
the additional space surrounding the solutes is water.
hypotonic - __________________________________________________________________________
___________________________________________________________________________________
isotonic - ___________________________________________________________________________
___________________________________________________________________________________
hypertonic - _________________________________________________________________________
___________________________________________________________________________________
Click on Next  Cells in Isotonic Solution
1. What is the concentration of salt in animal cells? _________________________
2. When cells are in isotonic solution, is there movement of water into or out of the cell? If so, describe
this movement. ______________________________________________________________________
___________________________________________________________________________________
Click on Next  Cells in Hypotonic Solutions
Describe the net movement of water molecules when cells are placed in a hypotonic solution.
___________________________________________________________________________________
___________________________________________________________________________________
Click on A Closer Look  A Closer Look at Plant and Animal Cells in Hypotonic Environments
**Make sure to ANIMATE the graphics.**
1. What happens to an animal cell when placed in a hypotonic solution?
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
2. Account for the different reactions between plant and animal cells when placed in a hypotonic
environment. ________________________________________________________________________
___________________________________________________________________________________
Click  Back to Review then Next  Cells in Hypertonic Solutions
Describe the net movement of water molecules when cells are placed in a hypertonic solution.
___________________________________________________________________________________
___________________________________________________________________________________
Click on A Closer Look  A Closer Look at Plant and Animal Cells in Hypertonic Environments
**Make sure to ANIMATE the graphics.**
What happens to animal cells when placed in a hypertonic solution?
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________