Waste products (fermentation products;acids, alcohols,CO2,and so on;reduced electron acceptors) Nutrients for biosynthesis Energy for biosynthesis Energy for motility. Anabolism transport (biosynthesis)】 of nutrients and so on Precursors for biosynthesis Macromolecules and other Catabolism cell components Chemicals,light (energy source) FIGURE 4.1 A simplified view of cell metabolism.Note the coupling between catabolic and anabolic processes