Lecture_E - Introduction to Metabolism Learning Objectives...

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Introduction to Metabolism • Catabolic and anabolic pathways • Energy flow in metabolism • Overview of catabolism Learning Objectives • Locations and control of metabolic reactions •ATP and Other High-Energy Compounds
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Definitions Metabolism (Greek : metabol , change) is a highly integrated cell activity involving hundreds enzyme-catalyzed reactions by which biomolecules are produced, maintained, and destroyed and by which energy is obtained and used. • Metabolism is divided in two parts: - catabolism - anabolism Catabolism (Greek: cata , down) is the sum of reactions of degradation in which nutrients and “own biomolecules” of the cell are broken down to produce energy and monomers necessary for the syntheses of biopolymers.
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Definitions Anabolism (Greek: ana , up) is the sum of reactions of biosynthesis in which biological molecules are synthesized from the smaller components. • Many specific metabolic reactions are common to all organisms. Variations in metabolic reactions are mainly due to differences in the source of the free energy.
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Autotrophs and Heterotrophs Autotrophs (Greek: autos , self + trophos , feeder) use CO 2 from atmosphere as the sole source of carbon. Photoautotrophs (e.g., higher plants) obtain energy from the sunlight. Chemolitotrophs (Greek: lithos , stone) obtain free energy through oxidation of inorganic compounds. • Living organisms are divided into autotrophs and heterotrophs
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Lecture_E - Introduction to Metabolism Learning Objectives...

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