All organisms and cells including prokaryotes and eukaryotes need energy . hence metabolism is compulsory of them to survive, grow and multiply. Metabolism is usually divided into two categories: catabolism, the breaking down of organic matter by way of cellular respiration, and anabolism, the building up of components of cells such as proteins and nucleic acids. Usually, breaking down releases energy and building up consumes energy. Metabolism means multiple process/reactions occurring together. A striking feature of metabolism is the similarity of the basic metabolic pathways operated by series of enzyme catalyse reactions in particular sequence. Citric acid is very well known compound found in all organisms and due to their early appearance in evolutionary history, metabolic process has compartmentalisation and regulation in order to maintain functional system in order to prevent entropy. Most metabolic process are under control of hormones and secondary messengers.
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