Chapter 6 Photoautotroph – plants, algae, use light energy and inorganic carbon to produce organic materials Photoheterotroph – use light energy as sourse, but cannot use carbon dioxide as their sole carbon source Chemoautotroph – bacterium derives energy from the oxidation of inorganic compounds Chemoheterotroph use organic chemical substances as sources of energy and organic compounds as main source of carbon Obligate aerobe – is an organism requires oxygen to grown, sugars, fats. Oxygen serves as the terminal electron acceptor for the electron transport chain. Obligate anaerobe microorganisms killed by normal atmospheric concentrations of oxygen Facultative anaerobe organism that makes ATP by aerobic respiration if oxygen is present, switching to fermentation if oxygen is absent