Diffusion Review Worksheet

Topics: Membrane biology, Osmosis, Cell membrane Pages: 2 (593 words) Published: February 18, 2013
1. Define diffusion and what causes it to occur?
The action of spreading the light from a light source evenly so as to reduce glare and harsh shadows. Diffusion is caused when entities are small and moving in molecules. They collide because they are moving at a random pace. The temperature causes diffusion. 2. Define the terms hypertonic, hypotonic, and isotonic solution. * Hypertonic: Having increased pressure or tone, in particular. * Hypotonic: Having reduced pressure or tone, in particular. * Isotonic solution: a solution having the same osmotic pressure 3. Explain the similarities and differences between diffusion and osmosis. Both are the movement of a substance from an area of high concentration to an area of low concentration. But osmosis is the movement of water through a cell membrane. 4. Define Turgor pressure ( also known as osmotic pressure). The pressure that would have to be applied to a pure solvent to prevent it from passing into a given solution by osmosis, often used to express the concentration of the solution 5. What occurs when plasmolysis takes place?

The cells shrink and shiver.
6. Define the terms endocytosis and exocytosis .
* Endocytosis: the taking in of matter by a living cell by its membrane to form a vacuole. * Exocytosis: Large molecules that are manufactured in the cell are released through the cell membrane. 7. Name the two processes that occur during endocytosis.

8. What are the differences between active and passive transport? * Requires energy or ATP
* Doesn’t require energy, moves high to low concentration 9. Define facilitated diffusion.
* The passage of both materials aided by both a concentration gradient and by a transport protein. 10. What is a carrier protein? What is its function?
* can change shape to move material from one side of the membrane to the other 11. What statement...
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