Hair is largely made up of the protein keratin. Why can a shampoo containing protein not replace the protein in damaged hair? a. The process of replacement needs more time than we spend on washing our hair.
b. Internal cell structures are assembled by living cells and cannot be replaced by molecules applied to the cell surface.
c. The hair's polypeptide is built up from amino acids, so shampoo must contain them instead of proteins.
d. Cells synthesize proteins from amino acids, not from whole proteins in food or other sources.
e. Proteins from a shampoo are synthetic and not organic as are the proteins of the hair.