Which group contains only molocules that are each assembled from smaller organic compounds?

The group that contains only molecules assembled from smaller organic compounds is known as macromolecules. These include carbohydrates, proteins, lipids, and nucleic acids, which are formed through the polymerization of smaller units called monomers. For example, proteins are made from amino acids, while carbohydrates are formed from simple sugars. Each of these macromolecules plays crucial roles in biological systems.