Coenzyme for phenylalanine hydroxylase is -: (A) Tetrahydrofolate, (B) Pyridoxal phosphate, (C) S-adenosyl methionine, (D) Tetrahydrobiopterin
Answer is D. Ans. is 'd' i.e., Tetrahydrobiopterino Phenylalanine metabolism is initiated by its oxidation to tyrosine which then undergoes oxidative degradation.