Lab 8 outline - c. facilitated diffusion : when molecule(s)...

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Neha Gautam Lab 8 Outline MOLECULAR MOTION I. Molecular Motion A. Three types: Brownian movement , diffusion , and osmosis 1. all have internal energy : sum total of several energy sources a. kinetic energy : energy an object has because of its motion 1. KE = ½ mass x velocity^2 (1/2mv^2) 2. temperature : amt. of molecular motion in a substance a. at absolute zero , no molecular motion 3. heat : an amount of energy transferred from 1 object to another because of a temp difference a. heat of combustion: amt of energy released when a substance is completely burned 2. Brownian Movement a. the constant + random motion of small particles caused by impact of surrounding molecules. (ex: pollen in water) 3. Diffusion a. molecules diffuse from a region of higher concentration to a region of lower concentration 1. result: net movement from high-conc to low-conc areas b. simple diffusion : all molecules move freely through membrane
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Unformatted text preview: c. facilitated diffusion : when molecule(s) can only pass through a specific channel in membrane 1. active transport : protein uses energy (ATP) to move a molecule from one side of a membrane to the other 4. Osmosis a. the net movement of water molecules through a differentially permeable membrane (restricts diffusion of certain molecules) II. In-Laboratory Exercises A. Brownian Movement 1. under microscope: 2 drops of detergent solution + lampblack (soot) B. Diffusion and Temperature 1. three petri dishes with wells + acetic acid C. Diffusion and Cell Size 1. Part 1: Materials diffusing into a cell 2. Part 2: Materials diffusing out of a cell D. Understanding Osmosis and its terminology 1. solute; solvent; hypertonic; hypotonic; isotonic E. Movement of Molecules F. Demonstration of Osmosis...
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This note was uploaded on 04/03/2008 for the course BIOLOGY 100 taught by Professor Transue during the Fall '07 term at Rutgers.

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