Lab Report - The Effects of Concentration on Rate of...

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The Effects of Concentration on Rate of Osmosis Biology 120 lab, Section 933 Professor S. Johnson February 28, 2008
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Introduction: Osmosis is the movement of water either into or out of a cell. (Thorpe 2007) Water can move in and out of a cell through its lipid bilayer membrane. A lipid bilayer membrane is the outer layer of a cell that is composed of two lipid layers. The water moves through this membrane in order to maintain an equilibrium environment. Diffusion is the tendency for molecules of ant substance to spread out evenly into the available space. (Campbell 2005) The cell has a semi-permeable membrane that particles can pass through selectively. The experiment looks at the rate of osmosis in an isotonic solution, where the number of particles in the solution is equal to the number of particles in the cell. It also considers the effect of the concentration gradient, to move from a higher concentration to a lower concentration in a hypotonic environment, where there are less particles in the solution than that of the cell and in a hypertonic solution, where there are more particles in the solution than that of the cell. The hypothesis is that water will move out of the cells in a hypertonic solution and the opposite will occur in a hypotonic solution. The result is a net weight change in the cell. The cells in a hypertonic
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Lab Report - The Effects of Concentration on Rate of...

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