Nutritional types of microorganisms Sources of energy, Major nutritional hydrogen/electrons, Representative type and carbon microorganisms Photoautotroph h Light energy inorganic Algae, Purple and green Photolithotroph) hydrogenelectron(H/)bacteria, Cyanobacteria donor CO, carbon source Photoheterotroph Light energy, inorganic Purple nonsulfur bacteria, H/e- donor Photoorganotroph) Green sulfur bacteria Organic carbon source Chemoautotroph Chemical energy source Sulfur-oxdizing bacteria (Chemolithotroph) (inorganic), Inorganic H/e Hydrogen bacteria donor, CO2 carbon source Nitrifying bacteria Chemoheterotroph Chemical energy source Most bacteria, fungi (Chenoorganotroph) (organic), Organic H/e protozoa donor, Organic carbon sourceMajor nutritional type Sources of energy, hydrogen/electrons, and carbon Representative microorganisms Photoautotroph (Photolithotroph) Light energy, inorganic hydrogen/electron(H/e- ) donor, CO2 carbon source Algae, Purple and green bacteria, Cyanobacteria Photoheterotroph (Photoorganotroph) Light energy, inorganic H/e- donor, Organic carbon source Purple nonsulfur bacteria, Green sulfur bacteria Chemoautotroph (Chemolithotroph) Chemical energy source (inorganic), Inorganic H/e￾donor, CO2 carbon source Sulfur-oxdizing bacteria, Hydrogen bacteria, Nitrifying bacteria Chemoheterotroph (Chenoorganotroph) Chemical energy source (organic), Organic H/e￾donor, Organic carbon source Most bacteria, fungi, protozoa Nutritional types of microorganisms