|MadSci Network: Biochemistry|
Amino acids are synthesized in the cytoplasms of almost every organism, although most heterotrophs, like animals and fungi, get the bulk of their amino acids from their food. Different amino acids use different pathways, so there isn't one general "amino acid synthesis pathway". However, there are several internet resources for metabolic pathways, one of which can be located at:
The Main Metabolic Pathways on the Internet
(You need to know the names of the various amino acids to find each pathway, but if you can find Tryptophan, Glycine, Proline, and Leucine, you'll get some idea of the pathways involved.)
Try the links in the MadSci Library for more information on Biochemistry.