LAB BIO1 - Victor Cruz Portillo BIO 150 Diffusion &...

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Victor Cruz Portillo BIO 150 17 Sept. 2010 / 24 Sept. 2010 Estefania Yacatoyo, Nadile Tousseant, Gisellis Correa Victor Cruz Portillo
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BIO 150 17 Sept. 2010 / 24 Sept. 2010 Estefania Yacatoyo, Nadile Tousseant, Gisellis Correa Introduction Kinetic energy, a source of energy stored in cells, causes molecules to bump into each other and move in new directions. This motion is the fuel for diffusion. Diffusion is the random movement of molecules from an area of higher concentration to an area of lower concentration. Osmosis is a special kind of diffusion in which water moves through a selectively permeable membrane. A selectively permeable membrane allows diffusion for only certain solutes or the substance being dissolved, and water, the most common solvent or a dissolving substance. A solution is the combination of both a solvent, usually water, and a solute in which a selectively permeable membrane is placed in. The most common selectively permeable membrane is the cell membrane. Water moves from an area of higher solution concentration to an area of lower solution concentration. The addition of solutes to a concentration will lower the amount of solution of that solute, causing water to move into the area. The water movement of osmosis is directly proportional to the solution concentration level. (Campbell, N., & Jane, R., 2008) Solutions can have three relationships with each other; isotonic, hypertonic, or hypotonic. In a hypotonic solution, there is also no net movement of water due to the fact that solutions have the same concentration of solutes. If the two solutions differ in solute
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concentrations, they will either be hypertonic or hypotonic. The hypertonic solution has a lower concentration of solute. Water will move out of a hypertonic solution, while solute will move in. The hypotonic solution has a higher concentration of solute, and therefore has less water. This solution will gain water, while losing solute. This movement between the hypotonic and hypertonic solutions will continue until the point of dynamic equilibrium is reached, and then there will be no net movement of water. (Sherwood, L., 2009) In this experiment, the hypothesis shall be that osmosis and diffusion will continue until dynamic equilibrium is reached and net movement will no longer occur. The prediction for the experiment of the ox blood shall be that if the red blood cell is placed in a isotonic solution, the red blood cells shall appear healthy and normal; that if the red blood cell is placed in a hypertonic solution, the red blood cells shall shrunken and dead; that if the red blood cell is placed in a hypotonic solution, the red blood cells shall appear bloated and lysed. The prediction for experiment involving carmine powder shall be that the particles of the powder will diffuse to the area with the lowest concentration. The predication for the experiment involving Elodea shall
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This note was uploaded on 11/18/2010 for the course BIO 150 taught by Professor Gioradano during the Fall '10 term at SUNY Suffolk.

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LAB BIO1 - Victor Cruz Portillo BIO 150 Diffusion &...

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