Lecture _6 - Energy, Enzymes and Metabolism

Lecture _6 - Energy, Enzymes and Metabolism - Energy...

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nergy Enzymes and Metabolism Energy, Enzymes and Metabolism Lecture #6 Campbell –Reece, 8th Edition Reading Assignment: Chapters 8 BIOL 203 – Spring 2010 Ralph Feuer
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Overview: The Energy of Life The living cell is a miniature chemical factory thousands of reactions occur he ell The cell Extracts energy and applies energy to perform work Some organisms even convert energy to light Bioluminescence Emission of light as the result of a chemical reaction Bioluminescence in Fungi
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Organization of the Chemistry of Life to Metabolic Pathways into Metabolic Pathways Enzyme 1 Enzyme 2 Enzyme 3 D C B A Reaction 1 Reaction 3 Reaction 2 Starting molecule Product An organism’s metabolism transforms matter and energy Subject to the laws of thermodynamics Metabolism m The totality of an organism’s chemical reactions An emergent property of life that arises from interactions between molecules within the cell A metabolic pathway begins with a specific molecule and ends with a product Each step is catalyzed by a specific enzyme
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Catabolic and Anabolic Pathways Catabolic pathways Release energy by breaking down complex molecules into simpler mp m mp compounds Cellular respiration The breakdown of glucose in e presence of xygen the presence of oxygen Example of a pathway of catabolism Anabolic pathways Consume energy to build complex molecules from simpler ones The synthesis of protein from amino acids is an example of anabolism ioenergetics Bioenergetics The study of how organisms manage their energy resources
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Forms of Energy Energy The capacity to cause change nergy exists in various orms Diving converts potential energy to kinetic energy. A diver has more potential energy on the platform than in the water. Energy exists in various forms Some of which can perform work Kinetic energy Energy associated with motion Heat (thermal energy) Kinetic energy associated with random movement of atoms or molecules Potential energy Energy that matter possesses because of its location or structure Chemical energy Potential energy available for release in a chemical reaction Energy can be converted from one form to another Climbing up converts the kinetic energy of muscle movement to potential energy. A diver has less potential energy in the water than on the platform.
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The Laws of Energy Transformation Thermodynamics The study of energy n s fm t i n s transformations A closed system is isolated rom its surroundings from its surroundings Liquid in a thermos pen system Open system Energy and matter can be transferred between the system and its y surroundings Organisms are open systems
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The First Law of Thermodynamics According to the first law of thermodynamics The energy of the universe is constant Energy can be transferred and transformed Chemical energy fm But it cannot be created or destroyed The first law lso alled the principle of Also called the principle of conservation of energy
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This note was uploaded on 03/07/2010 for the course BIO 203 taught by Professor Feuer during the Spring '10 term at San Diego State.

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Lecture _6 - Energy, Enzymes and Metabolism - Energy...

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