Biomolecules are the essential building blocks of life, found in all living organisms. They include proteins, carbohydrates, lipids, and nucleic acids. Each type of biomolecule plays a unique role; for example, proteins help build and repair tissues, while carbohydrates provide energy. These molecules are made up of smaller units called monomers, which link together to form larger structures. For instance, amino acids are the monomers that make up proteins, and nucleotides are the building blocks of DNA. Understanding biomolecules is crucial for fields like biochemistry and molecular biology, as they help explain how life functions at a molecular level.