Ch08 Key Concepts and Vocabularyl-Energy, Enzymes, and Metabolism

Ch08 Key Concepts and Vocabularyl-Energy, Enzymes, and Metabolism

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Chapter 8: Energy, Enzymes, and Metabolism OVERVIEW Chapter 8 deals with energy and how cells use it. The chapter begins with a description of the first two laws of thermodynamics and their application to cellular processes, including anabolic and catabolic pathways. ATP hydrolysis is shown to provide energy to coupled endergonic reactions. The role of enzymes in lowering energy barriers is introduced. The chapter also describes the structure and function of enzymes, including active sites, shape changes, and the addition of chemical groups. Metabolic pathways and the regulation of enzymes by competitive and allosteric modulators are also discussed. KEY CONCEPTS 1. Energy is the capacity to do work. Energy occurs in two forms: potential and kinetic. 2. The first law of thermodynamics states that energy cannot be created or destroyed. The second law of thermodynamics states that, when energy is converted from one form to another, some of that energy becomes unavailable to do work. 3. Changes in free energy, total energy, temperature, and entropy are related by the equation Δ G = Δ H T Δ S . 4. Exergonic reactions have a negative Δ
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This note was uploaded on 11/11/2011 for the course BIOL 101 taught by Professor Staff during the Spring '10 term at Howard.

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Ch08 Key Concepts and Vocabularyl-Energy, Enzymes, and Metabolism

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