vacuole’s membrane‚ acts with the cell membrane of the cell to prevent the betacyanin from leaking into the cytosol or out of the cell. This lab investigates the environmental possibilities that can damage membranes. Hypertonic and hypotonic salt solutions place stress on cell membranes‚ detergents make lipids more water-soluble and disrupt membranes‚ and acidic and basic pH’s denature proteins and change the color of the betacyanin. The spectrophotometer
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random motion due to the collision between molecules of solute and that of the solvent. II. OBJECTIVES 1. Describe how diffusion takes place. 2. Distinguish between diffusion and osmosis. 3. Demonstrate osmosis in cells. 4. Describe hypotonic‚ isotonic‚ and hypertonic solutions. 5. Explain the effect of the different salt concentrations on cells III. PROCEDURE A. Diffusion of Solid in Water A pinch of potassium permanganate was dropped into a 250ml beaker containing water. The beaker was left undisturbed
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Know the differences between active vs. passive transport and how the subtypes of each work o Subtypes of passive transport- simple diffusion‚ facilitated diffusion- carrier mediated and channel mediated‚ osmosis o Be able to identify isotonic‚ hypertonic or hypotonic solutions and know what happens to a cell placed in each of these types of solutions. o Subtypes of active transport- primary active transport- main system = K+/Na+ pump to maintain the higher gradient of K+ inside the cell and Na+ outside
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osmosis different concentrations of solutes are compared. A solution that has equal concentrations of solute is isotonic. A solution with a higher concentration of solutes is hypertonic and one with less concentration of solutes is hypotonic. “The term osmolarity is used to describe the number of solute particles in a volume of Gluid. Osmoles
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Which of the following is least likely to increase the rate of diffusion? - small concentration gradient In general‚ to maintain homeostasis the relationship between our intracellular and extracellular fluids should be which of the following? - isotonic
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Introduction This experiment was osmosis and diffusion. In this experiment I began by calculating the volume of a fresh chicken egg. Then to determine the effect of osmotic pressure change on a cell I soaked the raw chicken egg in vinegar for 24 hrs‚ and measured the volume of the egg after the shell had been dissolved by the vinegar. The egg was then submerged in corn syrup for 1-24 hrs‚ then measured and recorded the new egg volume. Finally the egg was submerged in water for 1-24hrs‚ again the
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Fluid and Electrolytes Homeostasis t State of equilibrium in internal environment of body‚ naturally maintained by adaptive responses that promote healthy survival t Body fluids and electrolytes play an important role Water Content of the Body t Accounts for 60% of body weight in adult t 70-80% of body weight in infant t Varies with gender‚ body mass‚ and age Compartments t Intracellular fluid (ICF) t Extracellular fluid (ECF) l Intravascular (plasma) l Interstitial t Transcellular
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Dehydration In 1994‚ thousands of starving people died in the Africa nation of Rwanda. It wasn’t lack of food that killed most of these people‚ but cholera‚ a bacterial infected that cripples the ability of intestinal mucosal cells to reabsorb water. The severe diarrhea that develops can kill in days‚ sometimes even hours. Dehydration is deadly. Dehydration is a deficiency condition that occurs when output of water exceeds intake. It is a great problem for athletes‚ military personnel‚ and certain
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G. Y. S. Period: 6 09/11/12 Osmosis Lab I. Objective: The purpose of this lab is to put the solutions in chronological order from least to most molarity. If the solutions are hypertonic then‚ the water will go in and the order of the substances will be C‚ D‚ A‚ B‚ E. II. Materials and Methods: See attached page. Results: Table 1.1 III. Table 1.1 | Initial | Final | % Change | A | 11.4 | 11.86 | 4.03% | B | 11.67 | 15.33 | 33.68% | C | 10.84 | 11.86 | 9.4% | D | 12.02 |
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Diffusion‚ Osmosis‚ Active Transport There are two ways in which substances can enter or leave a cell: 1) Passive a) Simple Diffusion b) Facilitated Diffusion c) Osmosis (water only) 2) Active a) Molecules b) Particles Diffusion Diffusion is the net passive movement of particles (atoms‚ ions or molecules) from a region in which they are in higher concentration to regions of lower concentration. It continues until the concentration of substances is uniform throughout. Some major examples of diffusion
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