Which of the following substance is the first precursor of adrenaline formation?

Question: Which of the following substance is the first precursor of adrenaline formation?

A Tyrosine

B Dopamine

C Norepinephrine

D Serotonin

Answer: Tyrosine

Precursors involved in adrenaline formation	Chemical Formula	Name of enzyme involved	Reaction	Product formed
1st	Tyrosine	C₉H₁₁NO₃	Hydroxylase	Hydroxylation of tyrosine.	Levodopa
2nd	L-DOPA	C₉H₁₁NO₄	Decarboxylase	Decarboxylation of L-DOPA	Dopamine
3rd	Dopamine	C₈H₁₁NO₂	Hydroxylase	Hydroxylation of dopamine	Norepinephrine (Noradrenaline)
4^th	Norepinephrine	C₈H₁₁NO₃	Methyltransferase	Methylation of norepinephrine	Adrenaline (Epinephrine)

Which of the following substance is the first precursor of adrenaline formation?
By: Prof. Dr. Fazal Rehman Shamil | Last updated: February 3, 2024