<unk>  is a simple sugar with the molecular formula .<unk>  is the most abundant monosaccharide, a subcategory of carbohydrates.<unk>  is mainly made by plants and most algae during photosynthesis from water and carbon dioxide, using energy from sunlight, where it is used to make cellulose in cell walls, the most abundant carbohydrate in the world. In energy metabolism,<unk>  is the most important source of energy in all organisms.<unk>  for metabolism is stored as a polymer, in plants mainly as starch and amylopectin, and in animals as<unk> lycogen.<unk>  circulates in the blood of animals as blood sugar. The naturally occurring form of<unk>  is<unk> , while<unk>  is produced synthetically in comparatively small amounts and is of lesser importance.<unk>  is a monosaccharide containing six carbon atoms and an aldehyde<unk> roup, and is therefore an aldohexose. The<unk>  molecule can exist in an open-chain (acyclic) as well as ring (cyclic) form.<unk>  is naturally occurring and is found in its free state in fruits and other parts of plants. In animals,<unk>  is released from the breakdown of<unk> lycogen in a process known as<unk> lycogenolysis.<unk> , as intravenous sugar solution, is on the World Health Organization's List of Essential Medicines. It is also on the list in combination with sodium chloride. The name<unk>  is derived from Ancient<unk> reek (, "wine, must"), from (, "sweet"). The suffix "-ose" is a chemical classifier, denoting a sugar.
Glucose
Keto acid
Insulin
Insulin 
Glycogen
Calcium
Bile acid
Glucosamine