non-penetrating solutes.[2] Penetrating solutes can diffuse through the cell membrane‚ causing momentary changes in cell volume as the solutes "pull" water molecules with them. Non-penetrating solutes cannot cross the cell membrane‚ and therefore osmosis of water must occur for the solutions to reach equilibrium. A solution can be both hyperosmotic and isotonic.[2] For example‚ the intracellular fluid and extracellular can be hyperosmotic‚ but isotonic – if the total concentration of solutes in
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passive transport mechanisms include diffusion‚ osmosis‚ and facilitated diffusion. Diffusion is the movement of materials from an area of most concentrated to an area of least concentrated‚ which is equal to moving down a concentration gradient. When the molecules have reached equal concentrations in both locations‚ diffusion ends and it has reached equilibrium. Molecules continue to move‚ but move in both directions equally; there is no net change! Osmosis is the movement of water. It moves water
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type is active processes which use energy known as ATP to power the transport. There are two main types of passive processes called diffusion and filtration. This can be split into different types such as simple diffisuion‚ facilitated diffusion‚ osmosis and filtration. The objective of these experiments is to provide information on the passage of solutes and water through semi permeable membranes and relate them back to the study of actual living membranes in the human body. The purpose is to
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Aim: To observe and describe an example of osmosis. Hypothesis: I predict that the water level will rise as the iodine stained water moves through the cellulose bag due to osmosis. The iodine is there so we can see this happening. Materials: * Dialysis(cellulose) tubing * Thistle funnel * Gas jar * Retort clamp and stand * Rubber bands * 50mL beaker * Iodine/potassium iodine solution * 5% starch solution Method: 1) Fill the gas jar to 3 quarters full with
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behind diffusion and osmosis. Permeability‚ concentration gradients‚ plasmolysis‚ water potential‚ and equilibrium were also concepts that were delved into in this lab. Understanding how diffusion and osmosis works is essential to understanding biology. Each time a cell has something move into or out of it‚ some sort of principle studied in this lab is occurring. Diffusion‚ osmosis‚ and passive and active transport are all fundamental concepts of Biology. This lab simulated osmosis in the cell. In this
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following. I do hypothesis a different outcome in the experiment if the water was moving around opposed to sitting still. Part B: The Effect of Salt Concentration on Osmosis in Potato Cells. Introduction: 1. The purpose of doing this lab was to recognize the effects that salt‚ in different strengths‚ has on cells. 2. Osmosis is the movement of water molecules
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Movement in and out of cells Diffusion: (mixing molecules) Molecules and ions in a liquid or a gas move continuously. The movement is quite random‚ and the particles change direction as they bump into one another. The particles collide more often when they are close together (when they are concentrated) and so they tend to diffuse‚ or spread out‚ until they are spaced evenly throughout the gas or liquid. The random movement of particles is due to their own kinetic energy. When the diffusion
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Education 28: 83 – 85. Bland‚ W. and C. B. Tanner (1985) Measurement of the water potential of stored potato tubers. Plant Physiology 79: 891-895. Boyer‚ JS (1969) Measurement of the water status of plants. ARPP 20:351-364. Koning‚ R (1999) Web Site: Osmosis Lab. Kramer‚ P (1983) Water Relations of Plants. Academic Press‚ NY. Meidner‚ H (1984) Class Experiments in Plant Physiology. George Albert Unwin‚ Boston. Reiss‚ Carol (1994) Experiments in Plant Physiology. Prentice-Hall‚ Englewood Cliffs‚ NJ. Ross
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Activity 1 1. Describe two variables that affect the rate of diffusion. a. There are alot of different variables or factors that can affect the rate of diffusion‚ for example: size of the molecule‚ shape of the molecule‚ concentration gradient‚ charge of the ions‚ temperature‚ environment‚ etc. The rate of the diffusion can increase as diffusion distance increases‚ concentration gradient increases‚ surface area increases‚ temperature increases‚ and many more. 2. Why do you think the urea was not
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short time‚ the final results showed that the more water the potatoes were placed in‚ the more hypotonic the potato becomes. Tonicity is stated to be the state of a solution in respect of osmotic pressure. Types of tonicity used in this lab are osmosis and diffusion. In a way these two solutions are somewhat similar but differ in the way that diffusion refers to the movement of any chemical from one place to another‚
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