Estradiol is a type of estrogen which is normally secreted by the ovaries. It can be prescribed for many uses, including the relief of menopausal symptoms or for the prevention of osteoporosis and hormone replacement in women who are deficient in estrogen.
Each class of molecule has features that determine its use in living systems. The first class of molecules are called carbohydrates. The simplest type of these, monosaccharide simple sugars, have a basic formula: for every carbon atom, there are two hydrogens and one oxygen, or one water for each carbon. Carbo - hydrate.
Polysaccharides ( poly, means many) are important energy-storage and structural molecules. They are formed of long chains of sugars, most commonly glucose. Like oligosaccharides, they may be linear or branched. Important polysaccharides are starch, glycogen (animal starch), cellulose , and chitin . Starch and glycogen are similar energy-storage molecules found in plants and animals, respectively.