Bio 151 Lab Report-Osmosis

Bio 151 Lab Report-Osmosis - Biology 151 Lab Report Name...

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Biology 151 Name: Jessica Luke Lab Report Lab Section #: section 04 Observing Osmosis in Selectively Permeable Membranes Authors: Jessica Luke, Grant Vis, Kirsten Marshall, and Brittney Watt Introduction: When concentrations of solutes are unequal inside and outside the cell, either the solute or water will diffuse across the cell membrane, not using the transmembrane proteins (Varakin). When solutes cannot pass through the membrane, water will to equalize the concentrations. When water diffuses through a selectively permeable membrane, it is called osmosis (Brooker 93). The objective of this experiment was to determine the direction and rate of osmosis, in and out of cells in hypotonic, hypertonic, and isotonic conditions (Vodopich 89). When a cell is in a hypotonic environment, this means that there is more solute concentration inside the cell than outside. To equalize this concentration, water rushes into the cell, which then lyses (swells and then bursts). In plant cells, this will not happen because a cell wall around the cell stops the cell from swelling to the point of bursting. When a cell is in a hypertonic environment, this means that there is more solute outside the cell than inside. To fix this unequal concentration, water leaves the cell, causing crenation (shrinking) of the cell. In isotonic conditions, it has no effect on the cell as the concentrations are equal on both sides of the cell membrane (diffusion will still occur as it does not ever completely stop moving across a cell membrane). (Brooker 94) The rate
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