The macromolecule that contains units called monosaccharides is carbohydrates.

Here's why:

* Monosaccharides are simple sugars, the basic building blocks of carbohydrates.

* Carbohydrates are complex molecules made up of chains of monosaccharides. Examples of monosaccharides include glucose, fructose, and galactose. Examples of carbohydrates include starch, glycogen, and cellulose.

Let me know if you'd like to know more about the other types of macromolecules!