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Unformatted text preview: 10-15-08 Concepts of Metabolism I. Metabolic Pathways a. Chemical reactions in s a cell (e.g. 2000-4000) i. Synthesis of fatty acids, amino acids, sugars, lipids, proteins, polysaccharides b. Breakdown of lipids, proteins, polysaccharides: food to be used for resynthesis; toxic wastes 1. If it becomes useless ii. Other reactions: harvesting energy repair; synthesis of secondary compounds for signaling c. Map i. Each arrow represents one chemical reaction catalyzed by one enzyme 1. 1 line= 1 enzyme 4-lines= 4 enzymes ii. Some pathways can become more complex (branches) iii. Some pathways can branch together iv. Two different molecules can become the same molecule v. Two different molecules can fuse and become a different molecule d. QUESTION i. Why does a cell need to control the rates of reactions in pathways? 1. Insure a supply of building blocks 2. Avoid wastes by not overproducing compounds that cannot be used 3. Avoid accumulation of toxic compounds 4. Make as much of every compound as possible 5.5....
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