<prompt> Which of the following is derived from tyrosine -MelatoninSerotoninMelaninNiacin  <response>: Ans. is c i.e., Melanino Tyrosine is a precursor of many important compounds such as catecholamines epinephrine, norepinephrine , dopamine, thyroxine, triiodothryonine, melanin.o Dopamine b-hydroxylase is a copper containing monooxygenase that requires ascorbic acid and molecular oxygen.o It catalyzes the formation of norepinephrine. 