(1) The biochemistry of carotenoid biosynthesis has been well established.(2) Metabolic pathways involved in starch biosynthesis are different between source and sink tissues.(3) Roma might reflect a more or less continuous biosynthesis of new cell wall material.(4) Coordination of reproduction and yolk biosynthesis is achieved via the endocrine system.(5) Floral senescence in many species is regulated by ethylene biosynthesis .(6) Mutants affected in cellulose biosynthesis have been identified in vascular plants.(7) All previous theoretical analyses of metabolic costs of lignin biosynthesis used glucose as substrate.(8) Adequate measures were taken to protect the plants from biotic and abiotic stresses that may influence lignin biosynthesis .(9) In this pathway it is well known that biosynthesis is subject to both positive and negative feedback regulation.(10) Bacterial growth is directly linked to the capacity of the cells for protein biosynthesis .(11) However, fewer hormone biosynthesis or action mutants are known which exhibit greater than normal growth.(12) However, enzymes for their biosynthesis are found in both cell types.(13) In this mutant, a protein is inactivated which plays a key role during the negative feedback control of chlorophyll biosynthesis .(14) In vivo, the repression of genes involved in starch biosynthesis has been reported to block pollen development.(15) Cysteine biosynthesis is modified by regulators acting at the site of uptake and throughout the plant system.(16) This is an essential metabolic reaction that precedes the sucrose biosynthesis in the cytosol.
