So sucrose, just like lactose and maltose, is a disaccharide. And sucrose consists of two individual monosaccharides. One of them is the glucose, and the other one is fructose. And fructose exists as a five membered sugar. So sucrose is a disaccharide that consists of an alpha glucose bound to a beta fructose. Now, unlike in this particular case, in this particular case where the bond is between carbon one and carbon four, the bond in sucrose is between the two anameric carbons on the two different sugar molecules.