In premature births, one of the dangers that must be overcome is the difficulty in inflating the baby's lungs, because the surfactant has not yet reached an adequate level. In order to breathe, the infant must expand its lungs, breaking down the
bonds between fluid molecules that are trying to keep the lungs from expanding.

Protein and polypeptide sequences can be determined by first partially hydrolyzing the protein or polypeptide followed by amino acid sequencing of the fragment pieces using the chemical degradation process known as edman degradation. determine the sequence of the initial (18-amino acid) polypeptide that produces the following five partial sequences after hydrolysis and edman degradation.