I KNOW this is a lot of information to process. These macromolecules are the building blocks of life. They are what you eat. They are your source of energy and building blocks of you!
Carbohydrates: subunit is a Single Sugar. Think: Sugars, Starch, Cellulose
Lipids: subunit usually Fatty Acid. Think: Cell membranes, cholesterol, steroids, oil, wax!
Proteins: subunit is Amino Acid
READ about macromolecules in your textbook: page 44-48.