Capsomeres are protein units that are aggregated together to form the capsid. It is the protein coat that encloses nucleic acid, either DNA or RNA in virus. Since proteins are polymers made up of amino acids, joined together by peptide bonds. Capsomeres are made of amino acid.Example, TMV or Tobacco Mosaic Virus, where ssRNA is enclosed by spirally arranged capsomeresSo, the correct answer is 'Amino acids'