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Hormones, thyroxine, adrenaline and the pigment melanin are formed from

1. tryptophan
2. glycine
3. tyrosine
4. proline

Correct answer: tyrosine

Solution

Tyrosine is the key precursor used to make thyroxine, adrenaline, and melanin. These compounds are all synthesized through pathways that begin with tyrosine.

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