Cellular Physiology Notes from 2/1/16
Cellular Physiology Notes from 2/1/16 BZ 120
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This 1 page Class Notes was uploaded by John Bacovcin on Monday February 1, 2016. The Class Notes belongs to BZ 120 at Colorado State University taught by Dr. Ingrid Jane Slette in Winter 2016. Since its upload, it has received 41 views. For similar materials see Principles of Plant Biology in Biology at Colorado State University.
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Date Created: 02/01/16
Cellular Physiology Notes from 2/1/16 Water: Water has a molecular formula of H2O, one oxygen and two hydrogens. Its structure is that of an L with the two hydrogens bound to the oxygen at an angle 104.5 H H degrees. Water is also a polar molecule with the hydrogens being slightly positive and the oxygen being slightly negative. Water is allowed to do work because it has potential energy based off its physical position. This physical position leads to water gaining potential energy. This potential energy is called water potential abbreviated with the Greek letter (Ψ). Water will always move from a high water potential to a low water potential. Water can become a solution. A solution is the uniform solution mixture of molecules the thing being dissolved is the solute the thing doing the dissolving is the solvent. When describing the flow of things dissolved in water we use the term bulk flow. When something is in a solution it moves from high concentration to low concentration. An example would be while you’re making lemonade the lemon juice you add to the water will go spread from where it has high concentration to where it has a low concentration, this movement is called diffusion. When a solute is evenly distributed in the solvent it has reached equilibrium. The technical definition of equilibrium is when the concentrations of a solution is equal. There are many things that effect diffusion: 1. Temperature can increase the kinetic energy of a solution which will increase the rate of which diffusion. 2. Differences in concentration can help increase the rate of diffusion as well. This is based off a concentration gradient the gradient can go from high to low or from low to high. Things will always move down their concentration gradient from high to low. 3. The size of a molecule will also affect the speed of diffusion. Molecules of a large molecular weight will diffuse slower than lighter molecules which will go diffuse faster. 4. Agitation will also help the speed of diffusion increase. An example of this is when you are stirring in cocoa powder into your milk when making chocolate milk. When water is moving across a cell membrane down it’s concentration gradient it is called osmosis. The pressure cause by osmosis is called Turger Pressue. It is this preassure that helps makes cells grow.
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