ABSTRACT
This chapter begins by considering the biosynthesis of polysaccharides. After that, It deals with the biosynthesis of a kind of lipids, the triacylglycerols and that of amino-acids. Biosynthesis has not only the mission to build cellular components together with their corresponding suprastructures but it also has it also aims at multiplying because they have no control over their environment and self-multiplying is a means for them to survive. It can be noticed that glucose must be converted into a derivative of UDP just before the reaction forming the glycoside linkage occurs. No other nucleoside triphosphate can replace UTP in this reaction, except in the biosynthesis of cellulose in which guanosine diphosphate serves as the specific carrier. Lipids constitute a group of major elements of the cell structure. Their biosynthesis is complex because most of them contain more than one kind of chemical bond. The chapter ends with some elements devoted to the supramolecular chemistry.
