ws 14 2 oxytocin

Worksheet solving of Chemistry:

Oxytocin is a polypeptide that acts as a hormone. Its structure is shown below.

a. If oxytocin undergoes complete hydrolysis, how many amino acids would be produced? ___________

b. Notice that the polypeptide chain is cyclized; two cysteine residues form a covalent bond between their sulfur atoms (a disulfide bond). When the disulfide bond is broken, each S atom will gain a hydrogen atom (to become a thiol alcohol). Break the disulfide bond and draw the uncyclized polypeptide chain. Follow the convention and draw the polypeptide with the N-terminus on the left and C-terminus on the right.