Which of these is an example of a disaccharide?

Maltose is classified as a disaccharide because it is composed of two monosaccharide units. Specifically, it is formed from the combination of two glucose molecules through a glycosidic bond. This two-sugar structure categorizes maltose among disaccharides, which are carbohydrates consisting of two monosaccharides linked together.

In contrast, glycogen is a polysaccharide made up of many glucose units, and cellulose is also a polysaccharide composed of multiple glucose units joined together in a way that provides structural support in plant cell walls. Glucose itself is a monosaccharide, the simplest form of carbohydrate, consisting of a single sugar unit. Thus, among the options presented, maltose distinctly represents the disaccharide category.