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Chapter 6 - Chapter 6 Energy Flow in the Life of a Cell 6.1...

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Chapter 6 Energy Flow in the Life of a Cell 6.1 What is Energy? 6.2 How Does Energy Flow in Chemical Reactions? 6.3 How Is Cellular Energy Carried Between Coupled Reactions 6.4 How Do Cells Control Their Metabolic Reactions?
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Potential to kinetic energy Energy is the capacity to do work This chapter focuses on chemical energy
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6.1 What Is Energy? First Law of Thermodynamics (Law of Conservation of Energy) Energy is neither created nor destroyed Second Law of Thermodynamics When energy is converted from one form to another, the amount of useful energy decreases
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gas 100 units chemical energy (concentrated) 75 units heat energy 25 units kinetic energy (motion) + Energy conversion results in the loss of useful energy
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6.1 What Is Energy? Entropy A measure of the amount of randomness and disorder in a system Exergonic reaction Liberating (freeing) energy; a downhill reaction Endergonic reaction Requires an input of energy to proceed; an uphill reaction
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energy released reactants products Exergonic reaction
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Endergonic reaction reactants products energy used
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C O O O O O H H oxygen Burning glucose energy released glucose 6 6 6 water carbon dioxide Cellular Respiration does this
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O H H O C O O O 6 6 6 carbon dioxide water Photosynthesis glucose oxygen energy
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6.1 What Is Energy?
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