Catabolism is the set of metabolic processes that break down large molecules. These include breaking down and oxidizing food molecules. The purpose of the catabolic reactions is to provide the energy and components needed by anabolic reactions which build molecules. The exact nature of these catabolic reactions differs from organism to organism, and organisms can be classified based on their sources of energy and carbon (their primary nutritional groups), as shown in the table below. Organic molecules are used as a source of energy by organotrophs, while lithotrophs use inorganic substrates, and phototrophs capture sunlight as chemical energy. Zvisinei, zvose izvi zvakasiyana siyana metabolism pamusoro redox maitiro kuti zvinosanganisira kuchinjwa electrons kubva kuderedzwa mupiro mamorekuru akadai mvura, ammonia sulfide, nitric oxide kana ferrous ions?
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