Download Diffusion/Osmosis/Homeostasis

Diffusion/Osmosis/Homeostasis
Label the different types of diffusion below
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The diagram shows many proteins and other molecules embedded in a cell membrane.
1. What is the function of the cell membrane?
2. What are some of the functions of these proteins
and other molecules?
3. What is the cell membrane made of?
4. Match the term with its correct description:
a. energy
b. facilitated diffusion
c. endocytosis
d. passive transport
e. active transport
f. exocytosis
g. carrier protein
h. channel protein
________ Transport protein that provides a tube-like opening in the plasma membrane through which particles can diffuse
________ Is used during active transport but not passive transport
________ Process by which a cell takes in material by forming a vacuole around it
________ Particle movement from an area of higher concentration to an area of lower concentration
________ Process by which a cell expels wastes from a vacuole
________ A form of passive transport that uses transport proteins
________ Particle movement from an area of lower concentration to an area of higher concentration
________ Transport protein that changes shape when a particle binds with it
5. Match the term with its correct description:
a. transport protein
b. active transport
c. diffusion
d. passive transport
e. osmosis
f. endocytosis
g. exocytosis
h. equilibrium
_____ The diffusion of water through a cell membrane
_____ The movement of substances through the cell membrane without the use of cellular energy
_____ Used to help substances enter or exit the cell membrane
_____ When energy is required to move materials through a cell membrane
_____ When the molecules of one substance are spread evenly throughout another substance to become balanced
_____ A vacuole membrane fuses (becomes a part of) the cell membrane and the contents are released
_____ The cell membrane forms around another substance, for example, how the amoeba gets its food
_____ When molecules move from areas of high concentration to areas of low concentration
6. Complete the table by checking the correct column for each statement:
Statement
Causes a cell to swell
Doesn’t change the shape of a cell
Causes osmosis
Causes a cell to shrink
Isotonic solution
Hypotonic solution
Hypertonic solution
Explain what has happened in the diagram to the left.
7. Why did the large dark molecules NOT move to the left?
8. How is the semi-permeable membrane like a cell membrane?
9. If the dark molecule is starch, where is the starch concentration
greatest (left or right)?
10. If the white molecule is water, where is the water concentration
greatest at first?
11. In osmosis, water moves from an area of __________ to an area of _________ concentration. (higher/lower)
12. If the dark molecules could move, in what direction would they move? Why?
13. In diffusion, molecules move from an area of ________ to an area of ________ concentration. (higher/lower)
14. What is osmotic pressure?
15. Which way water will move in each of the following situations:
a. Salt inside the cell 65% and outside the cell 40%. ___________________________________
b. Sugar inside the cell 27% and outside 80%.
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16. What is homeostasis?
24. Comparison of active and passive transport
PASSIVE TRANPORT
ACTIVE TRANSPORT