ch05_lecture - Chapter5 Catalase 2H2O2>2H2O O2 WhatisEnergy...

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Ground Rules of Metabolism Chapter 5
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Catalase* Catalyzes the formation of oxygen  and water from hydrogen peroxide 2H 2 O 2  ----------> 2H 2 O + O 2
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What is Energy?* Capacity to do work Forms of energy Potential energy Kinetic energy Chemical energy
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What Can Cells Do  with Energy?* Energy inputs become coupled to  energy-requiring processes Cells use energy for: Chemical work Mechanical work Electrochemical work
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First Law of Thermodynamics* The total amount of energy in the universe  remains constant Energy can undergo conversions from one  form to another, but it cannot be created or  destroyed
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One-Way Flow of Energy* The sun is life’s primary energy source Producers trap energy from the sun and  convert it into chemical bond energy All   organisms use the energy stored in the  bonds of organic compounds to do work 
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Entropy* Measure of degree of disorder in a system The world of life can resist the flow toward  maximum entropy only because it is  resupplied with energy from the sun
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Energy Changes &  Cellular Work* Energy changes in cells tend to  run spontaneously in the direction that  results in a decrease in usable energy  
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Endergonic Reactions* Energy input  required Product has more  energy than starting  substances product with more energy (plus by-products 60 2 and 6H 2 O) ENERGY IN 6 12
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Exergonic Reactions* Energy is  released Products have  less energy than  starting  substance ENERGY OUT energy-rich starting substance + 60 2 products with less energy 6 6
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