The hormonal factor responsible for circadian rhythm is formed from which amino acid?
Ans. is 'b' i.e., Tryptophan In circadian rhythm maintenance melatonin is involved which is derived from tryptophan.Tryptophan is a precursor for synthesis of niacin (nicotinic acid), serotonin and melatonin.
Tyrosine
Tryptophan
Phenylalanine
Histidine