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

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Unformatted text preview: 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? Potential to kinetic energy Energy is the capacity to do work This chapter focuses on chemical energy 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 gas 100 units chemical energy (concentrated) 75 units heat energy 25 units kinetic energy (motion) + Energy conversion results in the loss of useful energy 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 energy released reactants products Exergonic reaction Endergonic reaction reactants products energy used C O O O O O H H oxygen Burning glucose energy released glucose 6 6 6 water carbon dioxide Cellular Respiration does this O H H O C O O O 6 6 6 carbon dioxide water Photosynthesis glucose oxygen energy 6.1 What Is Energy?6....
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This note was uploaded on 01/11/2012 for the course BIO 160 taught by Professor Howardhaemmerle during the Fall '12 term at Bellevue College.

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

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