Biomolecules Monomer (building blocks): A molecule that reacts with other molecules to form large molecules (polymers). There are 4 biomolecules: Carbohydrates: Great source of energy. Some examples are pasta, bread, and rice. Monomer: Monosaccharide Lipids (Fats): Great for insulation and a great source of long-term energy. They also make up cell membranes. Some examples are butter, oil, and cholesterol. Monomer: Glycerol and Fatty Acids Proteins: Great in muscle development, immune system, and most importantly, acting as enzymes. Some examples are meat and beans. Monomer: Amino Acids Nucleic Acids: Include DNA and RNA. Some examples are pasta, bread, and rice. Monomer: Nucleotides