The book is divided into four chapters. The first chapter gives a detailed account of metabolism at genetic level. It explains the mechanism of genetic expression in both prokaryotes and eukaryotes. The second chapter discusses about the mechanisms for processing of protein and RNA. It also covers the major techniques deployed for identification of these unknown biomolecules. The chapters following it throw light over the various databases of metabolic pathways and explains how to modulate and simulate various metabolic network properties.