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Poly=many, meros=parts

A macromolecule is defined as a molecule which consists of around(it's arbitrary) 1000 atoms. A polymer is a molecule (yes! only 1 molecule!) which is synthesized(polymerized) by the joining of the smaller units of the polymer, called the monomer. A polymer is thus a macromolecule because it is obviously going to be large due to smaller units joining onto each other repeatedly. But that does not necessarily mean a macromolecule is a polymer.

A fat, for example, is a synthesized by the condensation reaction of only 4 molecules- glycerol and 3 fatty acids. It is big, but does not consist of repeating smaller units.

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