Which two options are considered polysaccharides?

Polysaccharides are large, complex carbohydrates composed of many monosaccharide units linked together by glycosidic bonds. Starch and glycogen are both excellent examples of polysaccharides.

Starch serves as a storage form of glucose in plants, composed of two components: amylose (a linear chain of glucose units) and amylopectin (a branched structure). Glycogen, similarly, functions as the primary storage form of glucose in animals. It is more highly branched than starch, allowing for rapid mobilization of glucose when energy is required. Both starch and glycogen have high molecular weights and consist of long chains of glucose, classifying them firmly as polysaccharides.

The other options include disaccharides, which are sugars made of two monosaccharide units. Maltose (composed of two glucose molecules), sucrose (composed of glucose and fructose), and lactose (composed of glucose and galactose) are all disaccharides and therefore do not meet the criteria for polysaccharides. Keratan sulfate, on the other hand, is a type of glycosaminoglycan and is also not classified as a polysaccharide in the traditional sense observed with starch and glycogen