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Exercise 9

by: Luis Leyva

Exercise 9 BIO 1105

Luis Leyva
Baylor University
GPA 4.0

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About this Document

Review of exercise 9 for test
Modern Concepts in Bioscience Lab
Dr. Adair
Study Guide
50 ?




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This 2 page Study Guide was uploaded by Luis Leyva on Tuesday September 20, 2016. The Study Guide belongs to BIO 1105 at Baylor University taught by Dr. Adair in Fall 2016. Since its upload, it has received 7 views. For similar materials see Modern Concepts in Bioscience Lab in Biology at Baylor University.

Similar to BIO 1105 at Baylor University


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Date Created: 09/20/16
Exercise 9 Review Molecules display random thermal motion or kinetic energy  Kinetic Energy o Causes diffusion from high to low concentration areas Brownian Movement  the erratic random movement of microscopic particles in a fluid, as a result of continuous bombardment from molecules of the surrounding medium.  1827 by Robert Browning Diffusion  Passive directional movement  Direction depends on the concentration gradient, heat, and pressure o Usually move from high to low concentration areas  Membrane are selective and differentially permeable o Results from the basic structure o the membranes  Polar molecules o Have positive and negative charged areas  Nonpolar molecules o No net charge o Pass most easily through the lipid core of membrane  Dialysis o Separation of dissolve substances by means of their unequal diffusion through a differentially permeable membrane. Osmosis  Diffusion of water across a differentially permeable membrane Solution  Mixture of two or more molecules  Solvent o Dissolves substances  Solute o Dissolved in the solvent Hypotonic  Lower concentration of solute Hypertonic  High concentration of solute Isotonic  Equal concentration of solute Water Potential  Flow of water from an area of high water potential to an area of low water potential Hemolysis  If placed in a hypotonic solution a red blood cell wall will burst. o This process is called Lysis (hemolysis)  If placed in a hypertonic solution the cell wall will shrivel and become crenate. Plasmolysis  Shrinking of the cytoplasm of a plant cell in response to diffusion of water out of the cell when place in a hypertonic solution. Phenolphthalein  PH indicator o Turns red in basic solutions Iodine  Changes from yellow to blue in presence of starch


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