LS 2 Lecture 4 - Life Sciences 2 Energy Enzymes Metabolism...

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1 Life Sciences 2 Energy, Enzymes, & Metabolism Chapter 8 Dr. Joseph Esdin Proteins Proteins made inside the cell are found – Embedded or attached to the plasma membrane – In the cell cytosol
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2 Energy, Enzymes, and Metabolism In living organisms, thousands of enzyme catalyzed reactions occur Catalysis occur due to the 3-D shape of the proteins involved Metabolism is the combination of all of these reactions Anabolic Reaction Catabolic Reaction Reactions build macromolecules Reactions breakdown macromolecules Chemical Reaction
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3 Energy and the Laws of Thermodynamics Bioenergetics is the flow of energy in biochemical systems Energy is defined as the capacity to do work Forms of Energy: Heat, light, electrical, and chemical Energy and the Laws of Thermodynamics Kinetic energy is the energy associated with motion
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4 Energy and the Laws of Thermodynamics • Potential energy is the energy of state or position Energy and the Laws of Thermodynamics Energy before and after transformation is equal (no energy is created or lost) After energy transformation The amount of energy available to do work is less
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5 Energy and the Laws of Thermodynamics With repeated energy transformations usable energy decreases and unusable energy increases Energy and the Laws of Thermodynamics With repeated energy transformations usable energy decreases and unusable energy increases
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6 Energy and the Laws of Thermodynamics In a closed system, no energy or matters enters or leave • Quantity Vs. Quality Energy and the Laws of Thermodynamics
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