Fate of Introduced Bacteria and Enzymes

The primary habitat for Bacillus sp. is the soil. In this environment, they remain inactive until a suitable substrate (food source) becomes available. Usually these substrates include large molecules from the remains of plants and animals. The large molecules, like proteins, lipids, and carbohydrates are suitable substrate for Bacillus sp. because these strains excrete enzymes which break these molecules into smaller, more soluble compounds.