Biology 1201 Exam 2 Notes

Biology 1201 Exam 2 Notes - Biology 1201 Exam 2 Notes...

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Biology 1201 Exam 2 Notes Transport Processes Active o Against concentration gradient o Requires supplied energy (ATP) o Carrier molecule Passive o Down concentration gradient o Does not require supplied energy o Diffusion (simple or facilitated)-Fig. 7.15 Two molecules for facilitated diffusion Clicker Clicker : Active Requires energy & Employs a carrier molecule Diffusion Movement… Physical property of matter Individual molecules move randomly, but the net effect is non-random What force causes the net movement? Thermal energy (measured by temp) Fig. 7.15 Two models for facilitated diffusion Fig. 7.11, Fig. 7.17 Review: Passive and Active Transport compared Osmosis Fig. 7.12 The NET MOVEMENT of water across (through) a SEMI-PERMEABLE membrane Diffusion of water From higher (fewer solutions) water potential to lower water potential Clicker: Higher water potential=high free energy of water. Answer: low (solutes) Clicker: In osmosis water moves from the compartment with the high free energy to the compartment with low water potential. Answer: true Problems confronting oraganisms What is the concentration of solutes differs between the intracellular compartment and the environment? Hypertonic Lower water potential More solutions dissolved Hypertonic solutions will tend to gain water Hypotonic Higher water potential Fewer solutes dissolved Hypotonic solutions will tend to lose water Isotonic Equivalent water potential Equivalent number of solutes dissolved No net movement of water Fig. 7.13 The Water Balance of Living Cells CLICKER : When solute concentrations are…False Marine Invertebrates Isotonic with seawater Accumulate free amino acids to match the tonicity of seawater Marine elasmobranch fishes
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Sharks and rays Isotonic with seawater Accumulate up to 0.5M urea Freshwater bony fish (teleost fish) Hypertonic tonic to fresh water Marine bony fish (teleost fish) Hyptonic to seawater CLICKER : Isotonic marine invertebrates tend to: lose or gain water? NEITHER. CLICKER : Freshwater teleost fish tend to: gain water CLICKER : Marine teleost fish tend to: Lose water CLICKER : What kind of molecules would pass through a membrane, i.e., a phospholipid bilayer? Small, Nonpolar CLICKER : An Experiment: Which way will the water flow? To the right (the high sugar concentration) When does the NET movement to the right stop? Until there’s equal concentrations on the left and right CLICKER : A marine teleost fish is HYPOTONIC to sea water. CLICKER : A marine teleost fish will tend to LOSE water. How Do Cells Regulate Metabolism?
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This note was uploaded on 08/22/2010 for the course BIOL 1201 taught by Professor Wishtichusen during the Spring '07 term at LSU.

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Biology 1201 Exam 2 Notes - Biology 1201 Exam 2 Notes...

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