Glucose is an example of a monosaccharide. Monosaccharides join together to form disaccharides, oligosaccharides and polysaccharides. Oligosaccharides contain from three to ten monosaccharides. Starch is a polysaccharide composed of amylose and amylopectin. Digestion of starch begins in the mouth by an enzyme called amylase. This amylase can break only 1-4 glycosidic bonds. Only disaccharides and oligosaccharides are produced during this reaction. The diagram shows part of an amylopectin molecule. Key O glucose molecule joined by 1-4 glycosidic bonds glucose molecule joined by 1-4 and 1-6 glycosidic bonds Draw one disaccharide and two different oligosaccharides that could be produced following the digestion of this part of amylopectin by this amylase. (2)

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