gain or loss in animal and plant cells. INTRODUCTION: Osmosis is the tendency of water to flow from a hypotonic solution (low concertration of dissolved substances) to hypertonic solution ( higher concerntration of dissolved substances) across a semipermeable membrane. Osmosis occurs when different concentrations of water are separated by a differentially permeable membrane. One example of a differentially permeable membrane within a living cell is the plasma membrane.
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Cell Transport Mechanisms Essay There are two methods of moving molecules across the cell membrane‚ passive transport and active transport. Passive transport doesn’t use energy‚ while active transport does use energy. Passive transport allows molecules to move on their own according to natural laws of physics. The three types of passive transport mechanisms include diffusion‚ osmosis‚ and facilitated diffusion. Diffusion is the movement of materials from an area of most concentrated to
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use only Activity 1: Simulating Dialysis (Simple Diffusion) Lab Report Review Sheet Results 1. 2. Describe two Variables that affect the rate of diffusion. The two variables that affect the rate of diffusion are: A. The size of the molecule. The larger molecule will diffuse more slowly than the smaller molecule. B. The nature of plasma membrane. If the membrane is composed of lipid portion.‚ only lipid soluble molecules can pass through while water molecules cannot. 3. Why do
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inhabiting a high salinity environment is balancing osmotic pressure. Since these environments contain high salt concentrations‚ water from the cells of organisms spontaneously diffuses out of the cytoplasm in order to restore osmotic balance. This leaves cells dehydrated and thus‚ eventually causes cell death. In order to ameliorate this predicament‚ halophiles use one of two unique strategies that function to increase the osmolarity of the cell‚ both of which as illustrated in figure 4. One strategy
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Cell Transport Mechanisms and Permeability 1 EXERCISE 1 OBJECTIVES 1. To define the following terms: differential permeability‚ passive and active processes of transport‚ diffusion (simple diffusion‚ facilitated dif- fusion‚ and osmosis)‚ solute pump‚ pinocytosis‚ and phagocytosis. 2. To describe the processes that account for the movement of sub- stances across the plasma membrane‚ and to indicate the driving force for each. 3. To determine which way substances will move passively
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Assignment no.1 (Finals) 1.)What is Osmosis? Osmosis is the diffusion of the movement of water from a region of higher concentration to a region of lower concentration through a cell membrane or other semi-permeable membrane until an equilibrium is reached. It is a special case of diffusion (passive transport). Basic Explanation : Osmosis can occur when there is a partially permeable membrane‚ such as a cell membrane. When a cell is submerged
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Cell Membrane Permeability and Osmosis Experiment 3 Objectives: To demonstrate the mechanism involved in Osmosis; To demonstrate the tonicity of solutions by subjecting the cells to different concentration of solute. To view‚ under the microscope‚ any change in the shape and volume of the cells after subjecting them to different concentrations of solutes; To demonstrate the permeability of cell membrane by subjecting the cells to different solutes; To demonstrate the mechanism involved in
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CONTENTS * INTRODUCTION ----------------------------------------------------------- 3 * AIMS ----------------------------------------------------------- 4 * HYPOTHESIS ----------------------------------------------------------- 5 * RESULTS ----------------------------------------------------------- 6 - Calculations - Table 6.1 - Table 6.2 - Table 6.3 - Graph 6.1 - Graph 6.2 * DISCUSSIONS ----------------------------------------------------------- 7
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Exercise 1: Cell Transport Mechanisms and Permeability: Activity 1: Simulating Dialysis (Simple Diffusion) Lab Report Pre-lab Quiz Results You have not completed the Pre-lab Quiz. 09/20/11 page 1 Experiment Results Predict Question: Predict Question 1: The molecular weight of urea is 60.07. Do you think urea will diffuse through the 20 MWCO membrane? Your answer : c. No‚ not at all. Predict Question 2: Recall that glucose is a monosaccharide‚ albumin is a protein with 607 amino acids‚ and
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The different cell membrane transport mechanisms The cell membrane is referred to as a ‘fluid mosaic model’ because the protein part within the cell membrane used to be though of as an even layer spread over the outside and the inside of the phospholipid. Now we are starting to think that it is spread unevenly‚ more like a mosaic than a layer. The phospholipid part of the cell membrane is fluid; this means that its molecules are constantly moving about. Through the molecules constantly moving
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