Index >> Bacterial Nutrition >> Obligate Autotrophs

Obligate Autotrophs-Obligate autotrophs are organisms which fix CO2 as their major source of carbon through the Calvin-Benson cycle, and which use inorganic chemicals as their sources of energy or as electron donors (if photosynthetic). It should be noted, however, that all autotrophs can use organic compounds such as acetate as acetate secondary sources of carbon.