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Solution


Q.

The amino acid tryptophan is the precursor for the synthesis of           [2016]
1 estrogen and progesterone  
2 cortisol and cortisone  
3 melatonin and serotonin  
4 thyroxine and triiodothyronine  

Ans.

(3)

Tryptophan is an essential amino acid which is precursor for the synthesis of melatonin and serotonin.