The purpose of this lab was to hypothesize about membrane traffic in lab‚ explain the differences between the solutions hypertonic‚ hypotonic‚ and isotonic and how they respond using the understanding of the cell membrane structure‚ types of transport mechanisms such as active‚ passive‚ diffusion‚ osmosis‚ and explain the movement of particles moving across the cell membrane. In this lab was divided into two parts. The first part was varying the concentration and the second part was varying the temperature
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effects the rate of osmosis Hypothesis: The more hypertonic potato pieces are to a saline solution‚ the more weight the potato will gain. However‚ the potato pieces will decrease in weight when they are placed in a hypotonic solution. Dependent variables: • Change in mass of pieces of potatoes. Independent variables: • solutions sucrose concentrations. Controlled variables: • amount of time in the solutions • surface area of the potato segments Factors held constant: Identify
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the molecules are delimited to move across the gradient‚ causing osmosis to slow down). In addition‚ pure water is always hypotonic solution‚ meaning that the pure water will cross the vegetables’ semipermeable membrane and level the concentration on both sides. Nevertheless‚ isotonic solutions eventuate when the two solutions emulate each other at equilibrium‚ and hypertonic solution is the propensity for water to flow out of the cell to help balance the concentration of the
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mass inside the tube filled with distilled water. The quantity of mass before and after was measured and saw the amount gained from the outside environment (either saline‚ sucrose‚ or water) of the cell. Also determined the amount of sucrose in the potato within the second experiment.
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Lecture: Plasma Membrane and Transport I. Structure of the Plasma Membrane A. plasma membrane - the surface encapsulating a cell B. Fluid Mosaic Model 1. bilayer of phospholipids a. hydrophilic heads - P04 end "water" "loving" attracted to water on inner/outer parts of cell b. hydrophobic tails - fatty acids "water" "fearing" attracted to each other on inside of bilayer c
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Osmosis is the diffusion of water across a semipermeable membrane. It occurs because of the concentration of a solute in a solution. In a hypertonic solution the concentration of the solute is higher and water is moved into the cell through osmosis‚ but in a hypotonic solution the concentration of the solute is lower and water is moved out of the cell. In an isotonic solution the concentration is the same in and out of the cell‚ and water moves in and out evenly. In facilitated diffusion carrier proteins
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hours. In low concentration of sodium chloride solution‚ the solution will be hypotonic to the egg because the concentration of solute in sodium chloride is lower than the concentration of solute in water. Water molecules move from hypotonic to hypertonic solution. Thus‚ water diffuses in the egg membrane by osmosis and the mass of egg increases. In high concentration of sodium chloride solution‚ the solution will be hypertonic to the egg because the concentration of solute in sodium chloride is higher
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Osmosis Lab Report by Evan Gerber Claire Cambron First Lab Report Wednesday 10:30am February 20‚ 2013 Theresa Gburek Abstract The major objective of the experiment was to test the effect of the concentration gradient on the diffusion rate. It was hypothesized that the greater the stronger the concentration gradient‚ the faster the rate of diffusion would be. To test this‚ dialysis tubes were submerged in different concentration fructose solutions. We weighed the tubes at specific
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program DNA 20. Golgi Apparatus- a membranous structure in the cytoplasm of cells consisting of layers of flattened sacs and functioning in the processing and transporting of proteins 21. Hypertonic solution- a solution in which water molecules are moving out of a cell‚ causing it to shrink 22. Hypotonic solution- A solution in which water molecules are moving into the cell‚ causing it to swell 23.
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Natalie Salaverria 01/21/11 LAB EXERCISE I After the first exercise : Simulating Simple diffusion Which Materials diffused from the left beaker to the right beaker? NaCl ‚ Urea ‚ Glucose Which did not ? Albumin Why ? Albumin’s Composition or charge was too great to diffuse through the membrane. After the 2nd activity : Simulating Dialysis What happens to the urea concentration in the left beaker (the Patient)? It diffused to the right beaker Why does this occur? The excess
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