Biochemistry 2280A Chapter Notes - Chapter 8: Atp Hydrolysis, Macromolecule, Cetyl Alcohol
25 Dec 2016
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Living: create/maintain order in universe tending towards disorder. Cells produce chemical reactions for molecules to meet metabolic needs. Atoms and energy both ultimately come from nonliving environment. Chemical reactions in cell: normally require much higher temperature than in cell. Product of one becomes reactant of the next. Metabolic pathways: long, linear reaction pathways that result from linking of multiple enzyme-catalyzed reactions. Metabolism: the sum total of all the chemical reactions a cell needs to survive, grow, reproduce. Catabolic pathways: break down food into smaller molecules. Generate useful form of energy and monomers for building blocks. Biosynthetic (anabolic) pathways: use energy harnessed by catabolism to drive synthesis of molecules that form the cell. Catabolic and anabolic pathways constitute the cell"s metabolism. Major portion of energy stored: in chemical bonds of food molecules. Only some of this energy can be converted to useful forms. Extract energy from environment, convert it to energy stored in chemical bonds.
