Sugars are carbohydrates - organic molecules with the empirical formula Cx(H2O)y - that are used as energy sources and structural components by all life on earth. Simple sugars contain one sugar unit, or saccharide. Other carbohydrates may contain 2 to several tens of thousands of saccharides.
Sugars in Nucleic AcidsEdit
The backbone of nucleic acids contains alternating sugar and phosphate units. RNA contains the sugar ribose, while DNA contains the sugar 2'-deoxyribose. The latter differs in the absence of an -OH group at the 2' position of the ring.