Multiple choice

Which of the following amino acids acts as precursor to hormones epinephrine, norepinephrine and dopamine?

  1. Tyrosine

  2. Threonine

  3. Tryptophan

  4. Proline

  5. None of these
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A Correct answer
Explanation

In dopaminergic cells in the brain, tyrosine is converted to L-DOPA by the enzyme tyrosine hydroxylase (TH). TH is the rate-limiting enzyme involved in the synthesis of the neurotransmitter dopamine. Dopamine can then be converted into norepinephrine and epinephrine.

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