INTRODUCTION 



Each step of the synthesis of any cell constituent is controlled by a 

 protein, the specific enzyme. This confers on proteins a unique position in 

 the activity and in the formation of cell material. It is to be expected that 



Fig. 3. A portion of an a-helix. The dashed lines figure hydrogen bonds 

 (Pauling and Corey, 1951). 



the biosynthesis of proteins will raise questions which are not encountered 

 for the biosynthesis of other constituents, since it is the formation of the 

 tools themselves which is now being considered. 



