Chapter 6 An Introduction to Metabolism

Chapter 6 An Introduction to Metabolism - Chapter 6 An...

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Chapter 6 An Introduction to Metabolism Lecture Outline Overview: The Energy of Life Concept 6.1 An organism’s metabolism transforms matter and energy, subject to the laws of thermodynamics The totality of an organism’s chemical reactions is called  metabolism . Metabolism is an emergent property of life that arises from interactions between  molecules within the orderly environment of the cell. The chemistry of life is organized into metabolic pathways. Metabolic pathways begin with a specific molecule, which is then altered in a series  of defined steps to form a specific product. A specific enzyme catalyzes each step of the pathway. Catabolic pathways release energy by breaking down complex molecules to simpler  compounds. A major pathway of catabolism is cellular respiration, in which the sugar glucose is  broken down in the presence of oxygen to carbon dioxide and water.
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