Biomolecules are divided into 4 groups, each group has different structures and therefore harbors different compounds:
1. lipids: fatty acids, cholesterol, etc.
2. proteins: aminoacids, peptides.
3. nucleic acids: DNA, RNA
4. carbohydrates: Sugars (glucose), Complex sugars (cellulose and starch)
Complex sugar is a carbohydrate composed of many glucose molecules intertwined with each other, one example is starch.