Rate limiting step in catecholamine synthesis:-: (A) Phenylethanolamine N-methyltransferase, (B) Dopadecarboxylase, (C) Tyrosine hydroxylase, (D) Tryptophan decarboxylase A
Answer is C. Catecholamines are epinephrine, norepinephrine and dopamine. L-DOPA is the precursor of all catecholamines The diagram given below shows the synthesis of L-DOPA and the rate limiting enzyme in the synthesis is tyrosine hydroxylase.