Name: KEY
Date: 4/4/16
Diffusion and Osmosis Worksheet
How are the molecules moving in the examples below (19)? Write: OSMOSIS or DIFFUSION.
1.
The student sitting next to you just came from gym
class and forgot to shower and you can tell. D
2.
After sitting in the bathtub for hours, your fingers
start to look like prunes. O
3.
The girl sitting two rows ahead of you put on too
much perfume this morning. D
4.
One way to get rid of slugs in your garden is to
sprinkle salt on them, so they shrivel up. D
5.
Yum! Something smells good. The neighbors are
cooking on the grill! D
6.
Gargling with salt water when you have a sore throat
causes your swollen throat cells to shrink and feel
better. O
7.
Oxygen molecules move from the air sacs in the
lungs across the cell membranes into the blood D
8.
Robert sprays water on the veggies in the produce
section to “plump them up”. O
9.
You put raisins in a glass of water and they plump up.
O
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Phospholipid Bilayer
Selectively permeable
High
Low
Active Transport
Simple Diffusion
Facilitated Diffusion
Word bank #10-16
10. The cell membrane is made of a phospholipid bilayer.
12. The cell membrane is selectively permeable. This
means that some ions and molecules can pass
through it without help, while others need help to
pass through it.
13. Diffusion always causes particles to move from a
region of high concentration to a region of low
concentration.
14. Do cells use energy when molecules diffuse in or out
of the cell down the concentration gradient? no
15. Active Transport requires energy (ATP) to
transport molecules against a concentration
gradient.
16. In simple diffusion and facilitated diffusion no
energy is used. Which one needs a helper to get
things across? Facilitated diffusion
Match each term on the left with the best descriptor
below. Use each only once
17. Concentration B
18. Diffusion A
19. Equal amount of water inside a cell as outside F
20. More water outside a cell than inside G
21. Osmosis C
22. More water inside a cell than outside E
23. Selectively permeable membrane D
Descriptor
.
a) Moves particles like oxygen into cells
.
b) Amount of a substance in a certain place
.
c) Moves water into and out of cells
.
d) Allows some substances through
. E)
F)
G)
24. You have just bought a tropical fish for your
freshwater aquarium. Unfortunately, you do not realize it
is a saltwater fish. Using your knowledge of osmosis,
explain why this fish will not survive in your aquarium.
The saltwater fish need to live in water that has a
hypertonic solution (high concentration) of salt. If it’s
in a hypotonic solution (low concentrations), the water
will rush into the fish, which will cause its cells to
explode.