Final answer:
Digestion converts macromolecules into monomers: carbohydrates into simple sugars, proteins into amino acids, lipids into glycerol and fatty acids, and nucleic acids into nucleotides.
Step-by-step explanation:
After digestion, macromolecules in the form of carbohydrates, proteins, lipids, and nucleic acids will be converted into their respective monomers. Carbohydrates are broken down into simple sugars (monosaccharides) like glucose, proteins into amino acids, lipids into glycerol and fatty acids, and nucleic acids into nucleotides. These monomers are then absorbed by our cells and can be reassembled or converted through condensation reactions into new polymers or other molecules that our bodies need.