n.
Any very large molecule , composed of much larger numbers (hundreds or thousands) of atoms than ordinary molecules.
Some macromolecules are individual entities that cannot be subdivided without losing their identity (e.g., certain proteins , with molecular weights into the millions). Others ( polymers ) are multiples of a repeating building block ( monomer ) in chains or networks (e.g., plastics , cellulose ). Most macromolecules are in the size range typical of colloids .