Name _______________________________ Date ___________________ Period __________
Passive Transport
MAIN IDEA: Diffusion and osmosis are types of passive transport.
1. What is a concentration gradient?
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2. What does it mean for a molecule to diffuse “down a concentration gradient”?
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3. Complete the concept map below about passive transport using the following words or phrases:
osmosis, energy, facilitated diffusion, the movement of molecules from high to low concentration,
diffusion
Passive Transport
example
is
requires no
example
type of diffusion
is
the diffusion
of water
4. How does facilitated diffusion differ from simple diffusion?
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5. What will happen to the cells of a houseplant if you water it with concentrated salt water (a
hypertonic solution)?
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CONTINUE TO ACTIVE TRANSPORT QUESTIONS ON BACK!
Name _______________________________ Date ___________________ Period __________
Active Transport
1. How is active transport different than simple diffusion and facilitated diffusion?
2. The prefix exo- means “out of” and the prefix endo- means “taking in”. How do these meanings relate to the meaning of
exocytosis and endocytosis?
3.
A
B
What process is shown in Figure A?
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What process is shown in Figure B?
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4. Do you think that endocytosis and exocytosis can occur within the same cell? Explain your reasoning.
5. Predict: If the active transport proteins that transport waste out of a cell stopped working, how might the process affect
the cell?
6. Infer: What might you conclude about the membrane structure of the final vesicle formed during exocytosis and the cell
membrane? (What do you think it is made out of?)
7. Look at the diagram of the Sodium-Potassium Pump below (and check pg. 104 in your book) to perform the following
tasks:
In Fig. 1, describe what is
entering the protein from the
cytoplasm of the neuron:
1
2
It is activated by _________.
4
In Fig. 4, what is entering the cell
and how did it get there?
3
In Fig. 2, describe what happened
to the shape of the protein.
In Fig. 3, what is entering the
protein and what is leaving the
protein?