The complex relationships between the components in a system mean that a system is more than simply the sum of its parts. It has properties that are properties of the system a â¦ s a whole and cannot be attributed to any specific part of the system, known as 'emergent properties'.
A disaccharide (also called a double sugar or biose) is the sugar formed when two monosaccharides (simple sugars) are joined. Like monosaccharides, disaccharides are soluble in water. Three common examples are sucrose, lactose, and maltose.
In general, disaccharides and polysaccharides contain both reducing and nonreducing sugars. These carbohydrates are represented and their formulas are written from nonreducing end to reducing end. A common disaccharide is lactose, which is found only in milk. Lactose is formed from monosaccharides Î² -D- galactose and Î² -D- glucose . The anomeric carbon of the Î² -D-galactose molecule reacts with the C-4 hydroxyl group of the Î² -D-glucose molecule to form the glycosidic bond (see Figure 1).