ATMOSPHERIC carbon dioxide is converted to energy-rich molecules such as glucose by plants and other photosynthetic organisms.RuBP carboxylase is also known as Ribulose-1,5-bisphosphate carboxylase-oxygenase, RuBisCo, rubisco, RuBPCase, or RuBPco.RuBp carboxylase is the most abundant protein in leaves, accounting for 50% of soluble leaf protein in C3 plants and 30% of soluble leaf protein in C4 plants.β-galactosidase in Escherichia coli occurs when cells are exposed to the substance (substrate) upon which the enzyme acts to form a product.Enterokinase - It is also called Enteropeptidase, proteolytic enzyme (q.v.), secreted from the duodenal mucosa, that changes the inactive pancreatic secretion trypsinogen into TRYPSIN, ONE of the enzymes that digest proteins. Enterokinase is believed to be produced by the glands of Brunner in the membrane lining of the duodenum.It resists destruction from the various enzymes in the small intestine but is destroyed by bacteria in the large intestine.Enterokinase can also change inactive procarboxypeptidase into the active enzyme CARBOXYPEPTIDASE.