Biochemistry Rate limiting enzyme in catecholamine biosynthesis is A Tyrosine hydroxylase B Dopa Decarboxylase C Dopamine beta-hydroxylase (DBH) D Phenylethanolamine-N-Methyltransferase (PNMT) 💡 Explanation Rate limiting enzyme in catecholamine biosynthesis is ✓ Correct Answer: A. Tyrosine hydroxylase