Question

How are monomers, polymers and macromolecules related?

Answer 1

Monomers are smaller molecule, and when bonded together, make up polymers.

Fatty acids are the monomers for lipids, for example, and regardless of how they are bonded (as a saturated or unsaturated fat for example), they will form lipids.

Monosaccharides from carbohydrates (e.g maltose, a disaccharide, is made up of two molecules of glucose, a monosaccharide).

Amino acids make up proteins (so even through there are only $22$ natural amino acids, there are countless types of proteins that are formed with them)

The macromolecules of life are lipids, nucleic acids, carbohydrates, and proteins.