One of the most well-known carbon sources for bacterial growth is glucose, which converted into pyruvate in the process of glycolysis, which is then further processed in the TCA cycle (tricarboxylic acid cycle). Together, these pathways are among the most important chemical pathways for aerobic organisms, resulting both in the release of energy as well as building blocks used for the synthesis of amino acids and other essential metabolites required for growth. For microbes, growth is of course very directly related to reproduction, as every cell division results in a new (smaller) individual that again needs to grow. It is therefor no accident that both energy and building blocks are at the bedrock of the Virtual Microbe modelling platform. In the form of a user-defined artificial chemistry, Virtual Microbes have to synthesise both energy as well as building blocks, which are not directly available as a resource (see the tutorial if you are interested). 

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