It is perhaps self-evident that the metabolism of micro-organisms, and indeed of all living organisms, is under strict in vivo control. Micro-organisms show a remarkable reproducibility in structure and composition, a reproducibility that is maintained even when they are grown in media of widely different chemical composition. Moreover, rapidly growing micro-organisms usually accumulate, either intracellularly or in the environment, only very small quantities of compounds that could be used in synthesis of new cell material, which indicates that there is extremely little wastage during cell metabolism. There are many other examples that could be quoted to show the remarkable degree of control and economy that operates in the metabolism of micro-organisms.
KeywordsGenetic Code Enzyme Synthesis Catabolite Repression Allosteric Site Aspartate Kinase
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