And when we ingest the starch, the amylose, and the amylopectin, this is the enzyme that is responsible for breaking down these bonds and forming those individual glucose molecules. Actually, we form Maltose, and then maltose is broken down by Maltase at the brush border of our small intestine, as we discussed in the previous lecture. So glycogen is the polysaccharide that is used to store energy in animals, while starch is the polysaccharide that is used to store energy in plants. Now, let's move on to cellulose. Cellulose is actually one of the most common types of organic compounds on Earth, and cellulose is basically another very common type of polysaccharide that we'll find in plants. So cellulose, unlike starch and glycogen, plays a role in structure, and we'll see why that's the case.