AP Bio Lab Investigation #4 Osmosis and Diffusion

AP Bio Lab Investigation #4 Osmosis and Diffusion - An...

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An Observation of Diffusion and Osmosis Using Dialysis Tubing By Edward Acie Trimble 1
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Table of Contents Title .......................................................................................................................................... Pg. 1 Table of Contents ..................................................................................................................... Pg. 2 Abstract .................................................................................................................................... Pg. 3 Introduction ............................................................................................................................. Pg. 4 Methods ................................................................................................................................... Pg. 5 Results ..................................................................................................................................... Pg. 7 Conclusion ............................................................................................................................... Pg. 8 Citations ................................................................................................................................... Pg. 9 2
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Abstract In this project, we wanted to see how osmosis and diffusion function and its effect on cells. To observe this, we developed a test in which we placed protein, sucrose, water, glucose, and salt solutions into 5 different dialysis tubing to represent cells. We then placed the protein and glucose “cells” into a salt solution and the sucrose, water and salt “cells” into a water solution to observe the movement of water. The results showed that the sucrose, water, glucose, and salt “cells” all had an increase in weight, (sucrose increased by 12.6%, water by 2.9%, glucose by 5.4%, and salt by 3.7%), most likely caused by water entering the cells. The protein “cell” was the only one to have a decrease in weight (decreased by 1.9 %). 3
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Introduction Diffusion is the movement of a substance from a high concentration to a low concentration. It allows the transport and movement of nutrients without actually wasting any energy. A cell membrane may be selectively permeable, meaning it only lets certain substances pass through it. The cell membrane’s surface area is crucial in regulating substances that diffuse into or out of the cell, ( ). Osmosis is the movement of water across a selectively permeable membrane. Water, in this instance, moves from areas of low solute concentrations to areas of high solute concentrations. A hypertonic solution exists when a solution surrounding a
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