Which of the following chemical reaction is involved in the conversion of noradrenaline to adrenaline?: (A) Hydroxylation, (B) Carboxylation, (C) Methylation, (D) Dehydrogenation
Answer is C. Catecholamines are derivatives of phenylalanine/tyrosine. "Nor" in noradrenaline (norepinephrine) indicates the absence of methyl group. The methyl group of adrenaline (epinephrine) is derived from S-Adenosyl methionine (AdoMet)