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Cell and Molecular Biology for Environmental Engineers by Ryan Rogers

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CHAPTER 3

CELLULAR ENERGY PRODUCTION AND UTILIZATION

3.1 BIOCHEMICAL REACTIONS

The cumulative sum of biochemical reactions in a living system is known as metabolism. Metabolic reactions can be divided into two classes: ­catabolic reactions and anabolic reactions. Catabolic reactions break down large molecules into building blocks. These subsets of reactions break bonds and release energy; thus, they are referred to as exergonic reactions. The energy released from exergonic catabolic reactions is then used to synthesize biomolecules during anabolic reactions. These reactions do not occur spontaneously and require an energy source; therefore, anabolic reactions are considered endergonic reactions. Endergonic and exergonic reactions primarily ...

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