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Unformatted text preview: Chapter 8: An Introduction to Metabolism Overview: Then Energy of Life- The process known as cellular respiration drives the cellular economy by extracting the energy stored in sugars and other fuels- Cells apply this energy to do various things Transporting solutes across the plasma me mbrane Converting it to light (bioluminescence) Concept 8.1: An organisms metabolism transforms matter and energy, subject to the laws of thermodynamics- Metabolism: The totality of an organisms chemical reactions, consisting of catabolic and anabolic pathways, which manage the material and energy resources of the organism.- Arises from interactions between molecules within the cell A. Organization of the Chemistry of Life into Metabolic Pathways 1. Metabolic Pathway: A series of chemical reactions that either builds a complex molecule (anabolic pathway) or breaks down a complex molecule into simpler compounds (catabolic pathway). Each step is catalyzed by a specific enzyme Mechanisms balance metabo0lic supply and demand by regulating enzymes 2. Catabolic Pathways: A metabolic pathway that releases energy by breaking down complex molecules to simpler compounds. Cellular Respiration: glucose and other organize fuels are broken down in the presence of oxygen to carbon dioxide and water Pathways can have more than one starting molecule and/or product 3. Anabolic Pathways: A metabolic pathway that consumes energy to synthesize a complex molecule from simpler compounds Example: synthesis of protein from amino acids Catabolic pathways provide energy that can be used to perform anabolic pathways 4. The same way energy works in nonliving examples applies to the way it works in bioenergetics : The overall flow and transformation of energy in an organism. The study of how energy flows through organisms....
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This note was uploaded on 07/21/2010 for the course PHYS 2212 taught by Professor Lasater during the Spring '10 term at Albany State University.
- Spring '10