Input (grade 13): Polysaccharides are polymeric carbohydrate structures, formed of repeating units (either mono - or di-saccharides) joined together by glycosidic bonds.
Output (grade 12): When all the constituent monosaccharides are of the same type they are termed homopolysaccharides; when more than one type of monosaccharide is present they are termed heteropolysaccharides.