Some biological molecules are very large (macromolecules).Some macromolecules are made of repeating units (monomers) and are called polymers.Proteins(polypeptides), nucleic acids(polynucleotides) and polysaccharides are examples of biological polymers.The repeating units of proteins are amino acids.The repeating units of nucleic acids are nucleotidesThe repeating units of polysaccharides are simple sugars(saccharides) like glucose.