The document discusses organic chemistry and the key biomolecules that make up living organisms. It explains that organic compounds are created by living things and contain carbon. The four main types of biomolecules are carbohydrates, lipids, proteins, and nucleic acids. Carbohydrates, lipids and proteins are made up of monomers that join to form polymers, while nucleic acids are made of nucleotides that form DNA and RNA. Enzymes are discussed as protein catalysts that speed up biochemical reactions.