Pluricellular organisms are characterized by the existence of tissues, i.e. sets of cells which have acquired specialized functions. This specialization is advantageous in the sense that it permits a distribution of work but it necessitates means of controlling and integrating the activities of various tissues. Hormones constitute precisely a means of communication between territories distant […]
Effects of Hormones on Metabolic Activities | Biochemistry
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Effects of Substrate Concentration on Metabolic Activities
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The effects of variations of substrate concentration on the velocity of an enzymatic reaction. We may only add that in some cases, variations of substrate or co-substrate concentration [S] can exert important effects on the metabolism by permitting either the synthesis, or on the contrary the degradation of a substance X, or by determining the […]
Metabolism of Phenylalanine and Tyrosine | Biochemistry
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It is not surprising that the metabolism of these two aromatic amino acids is closely linked because they differ only by the presence of a phenolic OH in the tyrosine molecule. We will not study here their biosynthesis which — in organisms where it takes place, especially bacteria — starts from 2 compounds of the […]
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