Chemistry of Energy UseMetabolismThe total of all the chemical reactions occurring in living organisms is metabolism and the sequences in which they occur are the metabolic pathways. Cells can metabolize because they are isolated systems, separated from their environment by membranes. Organisms, and the cells of which they are composed, use enzymes to regulate the reactions and utilize energy carriers to move energy among the parts of the system. Metabolic reactions are linked so that exergonic reactions supply energy for the endergonic. Oxidation–reduction reactionsMost of the energy exchanges in plants are chemical reactions that involve the exchange of energy between one set of chemical bonds and another. These, for the most part, are oxidation-reduction reactions (commonly called redox reactions). In oxidation, electrons are lost
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