Stacy Hernandez Period 1 Mrs. Riley AP Biology Osmosis and Diffusion Lab I. Introduction: Diffusion is vital to many life functions of a cell‚ it allow the transportation of vitally important nutrients and compounds without the expenditure of excess metabolic energy. To explain diffusion‚ it is as if a bottle of perfume is opened at one end of the room‚ then in a short amount of time a person at the other end of the room can detect the scent of the perfume; this is the process of diffusion
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Honors Biology January 13 – 17‚ 2014 day do in class complete as homework 13 _ continue lab: Investigating Osmosis _ determine molarity of unknown solutions _ plot % change in mass by sucrose molarity _ use a best-fit line to determine the molarity of a russet potato _ write discussion of results · use CER · use vocabulary appropriately! _ due on January 15th _ pick up copy of graphic organizer: the Cell Cycle _ write NEWS assignment _ due tomorrow
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concentration to a region of lower concentration. Diffusion is the net movement of molecules down their concentration gradient. Diffusion can occur in gases‚ in liquids‚ or through solids. Osmosis is the process of water moving across the membrane from an area of high concentration to low concentration. Osmosis is a special case of diffusion where now water is moving across the membrane. [3]This process continues until both sides of the membrane are at a dynamic equilibrium state. A hypertonic solution
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Membrane Transport Objectives ► Referring to energy‚ what two ways can substances enter a cell? What is active transport? What is passive transport? How is osmosis related to diffusion? How can we demonstrate active transport? How can we demonstrate Brownian movement? How can we demonstrate diffusion (2 ways)? How can we demonstrate osmosis (3 ways)? In terms of relationships between substances‚ how can we define “hypertonic”‚ “isotonic”‚ and “hypotonic”? What is the relationship between the size
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balance and internal salt for several different reasons such as‚ compensating for water loss‚ avoiding excess water gain‚ and maintaining a proper osmotic concentration of the body fluids (Saladin‚ 2010). This process is derived from osmosis‚ however is much more complex. Osmosis is the diffusion of water down its cavity gradient through a semipermeable membrane. The aim of the experiment was to determine whether P. lurca (Phylum Sipuncula) was an osmoconformer and U. coarctata‚ a fiddler crab (Phylum
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Abstract I found that this experiment gives me an understanding on how osmosis and diffusion works. In its simplicity‚ it explains the process that our bodies (mainly cells) use all the time. It also showed me that even with the temperature changing‚ it doesn’t drastically change the rate of diffusion. Introduction Diffusion is important in all living systems. Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water
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consideration osmosis‚ and my knowledge about it‚ my prediction is that as the molarity of the solution under which the cells are exposed will increase‚ also the amount of plasmolysed cells‚ counted from amount of undamaged cells taken into account‚ will also increase. Hence‚ theoretically‚ the amount of plasmolysed cells in distilled water should be 0‚ while at 1mol solution‚ all of the relevant cells should be plasmolysed. This is so‚ because plasmolisys occurs due to loss of water through osmosis‚ which
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salt (Na)‚ 0.897% Na‚ 5.0% Na‚ and distilled water with a 0.0% Na solute concentration. My hypothesis is that cellular form and contents will either change or maintain form and consistency when introduced to these various different environments as osmosis occurs until a dynamic equilibrium has been reached between the membrane and its environment. It was found that when RBC’s are introduced to various solute concentrates their form and consistency did changed with highest amount of hemolysis evident
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PHYSICS 1. Plan to go to a place by a vehicle. Take readings of odometer and speedometer after every 2 minutes till you reach your destination. Record these observations in tabular form. Plot distance – time and speed – time graphs. State whether this motion is uniform or non-uniform. 2. Visit National Science Centre‚ Delhi (Near Pragati Maidan) and list 5 models based on motion/force/momentum/laws of motion. 3.
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Osmosis is a specialised form of diffusion. Water moves from an area of LOW concentration of Solute to an area of HIGH concentration of solute through a semi-or fully permeable membrane by the process. Water moves constantly through the cell ’s membrane its estimated that about 250 times the volume of a single cell moves through 1 per second This continues until the solute concentration reaches equilibrium It is convenient to express the available energy per unit volume in terms of "osmotic
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