Isopenoids are important metabolites in all living cells. In primary metabo
lisl, they are found in photosynthesis, respiration, growth factors and in
cell cycle control. In secondary metabolism, they interfere in plant defens
e against diseases and its adaptation to environmental conditions. Numerous
biotechnological products come from this metabolic pathway such as aroms a
nd essential oil components. Now this biosynthetic pathway is well known as
in procaryotic, eucaryotic cells and organels.