The amino acid Tryptophan is the precursor for the synthesis of :

1. Melatonin and Serotonin

2. Thyroxine and Triiodothyronine

3. Estrogen and Progesterone

4. Cortisol and Cortisone

Doubtly Asked 30 Oct 2026 NEET UG 2016 Phase 1 Practice test neet Save WhatsApp Report

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Answer: 1. Melatonin and Serotonin

Tryptophan is the precursor of melatonin and serotonin.

Thyroid hormones (thyroxine, T₃) are made from tyrosine.
Estrogen, progesterone, cortisol and cortisone are steroids derived from cholesterol.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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