What are large structures formed when molecules combine called?

Large structures formed when molecules combine are referred to as macromolecules. Macromolecules are typically made up of many smaller units called monomers that are chemically bonded together. These structures include proteins, nucleic acids (like DNA and RNA), carbohydrates, and lipids, all of which play essential roles in biological processes and the structure of cells.

The formation of macromolecules involves various types of chemical bonds, such as covalent bonds, which contribute to the stability and functionality of the resulting structure. The unique properties of macromolecules arise from their size, complexity, and the specific arrangements of their constituent monomers, which are crucial for their roles in biological systems.

Cells, while they can be formed from macromolecules, are not classified as macromolecules themselves. Ions and particles represent different categories of matter that do not fit the definition of large structures formed by molecular combinations.