Cellulose

Cellulose is a substance made of sugars, mainly glucose and fructose. Unlike most other oligosaccharides, it is digested only partially when eaten, but it still plays a major role in human activities, notably construction, paper making, silk production and timber industry. It is common in the cell walls of many organisms, most notably in the wood of trees, and other vegetals. It is therefore one of the main component of paper. In wood cellulose is the main component, along with lignin, a polymeric product of the pentose phosphate reaction chain.