The term “macromolecules” means “large molecules”.
The four kinds of biological macromolecules are: carbohydrates, proteins, lipids, and nucleic acids.
Some carbohydrates can be used for short- or longer-term energy storage, while others are used to provide structure to cells.
Proteins are composed of chains of amino acids. They function as enzymes, hormones, transport molecules, structural components and play vital roles in muscle contractibility, immunity, and blood clotting.
Triglycerides are the most common type of lipids, which include fats and oils. Triglycerides generally serve as long-term energy storage molecules.