Peptide formation in human hair.?

[Meghan]

On average, human hair grows 18cm per year. the fundamental structure of hair is keratin, a rope like protien that consists primarily of alpha helices. the alpha helix contains 3.6 amino acids and has a rise of 0.56 nm per turn. In other words each 0.56 nm of hair contains 3.6 amino acids. the rate determining step for hair growth is the formation of peptide bonds in the keratin chains. Calculate the rate of peptide formation in the keratin chains that would correspond to yearly hair growth.