6. Orange II is an anionic dye. Both cationic and anionic dyes are expected to bind tightly to protein fibers, because some amino acids (the monomeric units of proteins) can have sidechains (R) that are cationic or anionic. NH2 HO general structure of an amino acid general structure of a polypeptide Look up the structures of the common amino acids and answer the following questions: a) Give an example of an amino acid whose sidechain, at neutral pH, would be strongly attracted to a cationic dye. Draw the sidechain in its predominant form at neutral pH (hint: it should be ionic). b) Give an example of an amino acid whose sidechain, at neutral pH, would be strongly attracted to an anionic dye. Draw the sidechain in its predominant form at neutral pH (hint: it should be ionic)