The amino acid tryptophan is the precursor for the synthesis of

  1. A) cortisol and cortisone
  2. B) estrogen and progesterone
  3. C) thyroxine and triiodothyronine
  4. D) melatonin and serotonin

Answer:D) melatonin and serotonin

Explanation: Tryptophan is the precursor for neurotransmitter serotonin and melatonin, which is a hormone secreted by the pineal gland. It is an essential amino acid and therefore cannot be produced in the body. It has to be supplemented in the diet.

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