Which one of the following hormones is derived most completely from tyrosine?
A. Glucagon
B. Thyroxine C. Insulin
D. Prostaglandins
Ans.
B. Thyroxine
Two of the major hormones are derived
from the amino acid tyrosine:
The
adrenal hormone epinephrineand the thyroid hormonethyroxine
tetraiodothyronine. . Epinephrine is the catabolic antagonist of insulin, a
polypeptide hormone, and is similar in action to glucagon, a liver-specific
polypeptide hormone. Thyroxine is important in governing the basal metabolic
rate.
