Name: ___________________________Period: _______
Biology Week #17
Week of: December 8th – 12th
Root Words
Day
Word:
Definition:
12/8:
Monday
12/10:
Wednesday
- Cell Membrane Notes
-Look at Gummy Bears
Picture:
-Late Arrival!
- Egg Osmosis Lab
Picture:
-Finish Egg Osmosis Lab
As in:
Word:
Definition:
12/12:
Friday
Picture:
As in:
Word:
Definition:
12/11:
Thursday
-Diffusion Video
-Gummy Bear Set up
-Catch up day…
As in:
Word:
Definition:
As in:
-
Homework
Picture:
As in:
Word:
Definition:
12/9:
Tuesday
In-Class
Picture:
-Quiz – Cell Parts, Cell
Membrane, and Diffusion
-Finish Packet
Need Help? Talk to me in class. I’m available during periods 4, 5 and 8. You can call me at 708434-3616 or email clundgren@oprfhs.org Also, Mr. Hill is in the Tutoring Center before school
on Tuesdays and Thursdays. Be sure to use the website mrlscience.weebly.com
1
Name: ___________________________Period: _______
Cell Membrane Notes
Problem: What is the cell membrane and why is it important?
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What is the cell membrane?
What does the cell membrane do?
What does the cell membrane look like?
2
Name: ___________________________Period: _______
What does it mean to have a high concentration or a low concentration?
What does it mean to be selectively permeable?
What is equilibrium?
What is diffusion?
What is an example of diffusion?
What is osmosis?
Type
What does it look like? How will
water move?
Plant cell
Animal cell
Isotonic
Hypotonic
Hypertonic
Conclusion: What is the cell membrane and why is it important?
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3
Name: ___________________________Period: _______
Gummy Bear Demo
Problem: What happens when we leave a gummy bear in water overnight?
The gummy bear represents a ________________.
We are placing the gummy bear in water:
Environment: PURE WATER
Predict what will happen to this cell:
_________________________________
Why?
_________________________________
Observations:
Day
Color
Length
Width
Thickness
1
2
Change
(Days 1-2)
What happened to the size of the gummy bear? Why?:
______________________________________________________________________
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The solution outside of the gummy bear was Isotonic, Hypotonic, or Hypertonic to the bear?
Why?:
______________________________________________________________________
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Name the substance that was diffusing through the cell membrane into the bear:
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Predict what would happen to the bear if we put it in extremely salty water? Why?:
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4
Name: ___________________________Period: _______
What Are Cells?
PROBLEM: Why are cells so important in living things?
EVIDENCE: Take the following notes to answer the question above.
5
Name: ___________________________Period: _______
Explain what a cell is? ________________________________________________
_________________________________________________________________
_________________________________________________________________
What are the three parts of the cell theory? ______________________________
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_________________________________________________________________
6
Name: ___________________________Period: _______
Egg Osmosis Demo
The eggs were placed in vinegar for 48 hours to dissolve the egg shells. The cell membrane
around the egg is semi-permeable.
What does it mean that the membrane is semi-permeable? ___________________________
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The mass of each egg will be taken on day 1. Then one egg will be placed into a beaker of pure
distilled water. The other egg will be placed into a beaker of karo syrup. The eggs will sit
overnight. On day 2 the mass of each egg will be taken again.
The egg is a ________________.
This egg was placed in ___________________ to dissolve its shell.
We are placing the egg in 2 different environments:
Environment: PURE WATER
Environment: CORN SYRUP
Predict what will happen to this cell:
____________________________
Why?
____________________________
Predict what will happen to this cell:
__________________________
Why?
__________________________
Observations:
Distilled (Pure) Water
Starting Mass
Final Mass
Change in Mass (+ or -)
7
Corn Syrup
Name: ___________________________Period: _______
Which egg gained mass? Why?:
______________________________________________________________________
______________________________________________________________________
______________________________________________________________________
Which egg lost mass? Why?:
______________________________________________________________________
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Which solution was Hypotonic to the egg? Why?:
______________________________________________________________________
______________________________________________________________________
Which solution was Hypertonic to the egg? Why?:
______________________________________________________________________
______________________________________________________________________
Name the substance that was diffusing through the cell membrane:
______________________________________________________________________
8
Name: ___________________________Period: _______
Particles Movement Assignment
1-9. Match the diagrams above with the proper terms.
1. Cell in a hypotonic solution.
2. Cell in a hypertonic solution.
3. Cell in an isotonic solution.
4. A cell that will burst.
5. A cell that will shrink.
6. A cell at equilibrium.
7. A cell with water going in faster than it goes out.
8. A cell with water going out faster than it goes in.
9. A cell with water going in and out in the same amounts.
10. What process do the diagrams above represent?
9
Name: ___________________________Period: _______
BOTH MOLECULES CAN MOVE THROUGH MEMBRANE
11. In the diagram above, will molecule C move to side B?
12. In the diagram above, will molecule D move to side A?
13. Will the net movement of molecule D be from side A to side B, or side B to side A?
14. At equilibrium, will the concentration of both molecules C and D be equal on both sides?
15. At equilibrium, will the molecules stop moving back and forth?
Conclusion: Explain a real life example of diffusion.
______________________________________________________________________
______________________________________________________________________
______________________________________________________________________
Conclusion: Explain why it is a bad idea to drink salt water using the terms (OSMOSIS,
HYPOTONIC, AND HYPERTONIC).
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10