Answer:
Monomer
Step-by-step explanation:
Monomers are the simple chemical compounds that are repeatedly bonded with each other to form complex macromolecules. Some macromolecules are made of small molecular fragments that are present in repetitive pattern. Examples of macromolecules are proteins, lipids, nucleic acids and carbohydrates. Proteins are the macromolecules that are made when many amino acids are bonded together by specific chemical bond.