Answer: 3. Tryptophan
As you see the structure of NIACIN resembles that of TRYPTOPHAN.
The parent ring in TRYPTOPHAN is called a INDOLE
So any BIOLOGICAL MOLECULE seeming to have a indole ring is seen to be derived from tryptophan
A COMPILATION OF ALL THE PRECURSORS COMMONLY ASKED IN MEDICAL EXAMS:
- TRYPTOPHAN:
a. AUXIN
b. NICOTINAMIDE
c. MELATONIN
d. SEROTONIN
- TYROSINE:
a. Thyroxine
b. Catecholamines: Epinephrine, norepinephrine, DOPAMINE
c. Melanin
- GLYCINE:
Used in synthesis of Heme and Chlorophyll
HAPPY LEARNING
