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Energy160-page4 - Metabolic pathways are used to build...

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Energy Flow in Cells - 4 Energy Flow in Chemical Reactions A chemical reaction takes one set of substances, called the reactants, (or sometimes, the substrate) and converts them to a different set of substances, called the products. Reactants ± Products Many chemical reactions rely on energy carriers to activate enzymes and other molecules needed to do the reaction. Some enzymes need cofactors and coenzymes to work. All are important. We will discuss a few of these. Metabolic Pathways Many of our metabolic reactions take place along pathways in a series of chemical reactions that must be tightly regulated for our cells to function.
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Unformatted text preview: Metabolic pathways are used to build complex molecules or do complex metabolic activities as well as to degrade. Pathways can be linear, branching or cyclical. Cellular respiration and photosynthesis are but two of the wonderful metabolic pathways of cells. Direction of Energy Flow Exergonic Chemical Reactions Some chemical reactions release energy -- the amount of energy in the products is less than that of the reactants. Such reactions are said to be exergonic. Exergonic Reactions of Cellular Respiration...
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