question_answer

Which one of the following hormones is a modified amino acid?

A)  Epinephrine                     

B)  Progesterone

C)  Prostaglandin                  

D)  Estrogen

Correct Answer: A

Solution :

Epinephrine is a modified amino acid. The Chromaffin cells of adrenal medulla synthesize two hormones-Adrenalin or epineprine and nor-adrenalin or nor-epinephrine. These hormones are proteinaceous in nature and derived from amino acid tyrosine. Epinephrine is derived by methylation of nor-epinephrine.  Tyrosine