Glucose molecules are the building blocks of what class of macromolecule

The answer to this question is: carbohydrate.

There are 3 kinds of macromolecule class: carbohydrates, lipid and protein. Carbohydrate used mostly for energy. The example for this class sugar, fiber and starch.

Lipid can be used for energy storage and make some hormone. The protein used for making muscle and cells component.