A molecule of high relative molecular mass, the structure of which essentially comprises the multiple repetition of units derived, actually or conceptually, from molecules of low relative molecular mass Notes: 1 In many cases, especially for synthetic polymers, a molecule can be regarded as having a high relative molecular mass if the addition or removal of one or a few of the units has a negligible effect on the molecular properties This statement fails in the case of certain macromolecules for which the properties may be critically dependent on fine details of the molecular structure 2 If a part or the whole of the molecule has a high relative molecular mass and essentially comprises the multiple repetition of units derived, actually or conceptually, from molecules of low relative molecular mass, it may be described as either macromolecular or polymeric, or by polymer used adjectivally [IUPAC Compendium]
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
A macromolecule is a polymer, especially one composed of more than 100 repeated monomers (which are single chemical units) A biological macromolecule is one which is involved in the processes of life and living organisms, such as proteins (haemoglobuliu) and deoxyribonucleic acid or DNA