Which of the molecules above cannot be hydrolyzed by the digestive system of most animals starch glycogen sucrose or cellulose?

Cellulose cannot be hydrolyzed by the digestive system of most animals because they lack the necessary enzyme, cellulase, to break down its β-glucosidic bonds. While starch and glycogen can be digested by animals due to their α-glucosidic bonds, sucrose can be hydrolyzed by the enzyme sucrase. Therefore, cellulose is the molecule that most animals cannot digest.