If hair grows at a rate of 24 cm per year, then what is the rate of peptide bond synthesis (peptide bonds per second) that would account for the observed growth of hair? Assume that biosynthesis of alpha-helical keratin chains is the rate-limiting factor for the growth of hair, and use the conversion factors: (one peptide bond/residue) * (3.5 residues/5.4 angstroms). Also, to simplify this problem, consider the growth of one keratin alpha-helix only. Record your answer to two significant figures.