Lab Report Testing Membranes

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Lab Report for Labs 2&3 Membrane Integrity Under Osmosis & Biological Membranes: Amphipathic and Alcohol Membranes By: Annika Bauer Section: 8 Introduction Each living organisms has cells and each of these cells have membranes. Because of their phospholipid bilayer, cell membranes are able to control what enters and exits the cell including water, waste, and other molecules. The small parts of the membrane that create this bilayer are phospholipids, each containing a hydrophilic head and hydrophobic tails. Being hydrophilic (attracted to water), the heads arrange themselves so that they are in contacts with water, leaving the hydrophobic tails (repelled by water) only in contact with each other, thus creating a bilayer membrane. Cell Membranes are what controls what enters and what exits the cell by the process of osmosis. When a cell is places in a solution in which the concentration of a solute in the surrounding environment is greater than the concentration within the cell, it is hypertonic. Water will leave the cell in order to dilute its surroundings. This will shrink and damage the cells interior. However, when is it placed in a solution where the concentration of the solute in the surrounding environment is less than the concentration within the cell, it is hypotonic. When this occurs, the cell will take on water and swell, still damaging the cells interior. When the concentrations are equal, it is isotonic; therefore, no water is needed to dilute the solutions and the cell remains the same. Cells react differently when placed in different solutions and in this experiment those reactions will be observed. By using beet slices and their betacyanin, tests will be conducted using a spectrophotometer in order to determine how much damage a certain solution does to a cell. In Lab 2, beet

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