Biochemistry Amino Acid Metabolism d4168c37 Coenzyme for phenylalanine hydroxylase is - A Tetrahydrofolate B Pyridoxal phosphate C S-adenosyl methionine D Tetrahydrobiopterin High-Yield Explanation Ans. is 'd' i.e., Tetrahydrobiopterino Phenylalanine metabolism is initiated by its oxidation to tyrosine which then undergoes oxidative degradation.