Question

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

• A. Proline
• B. Tyrosine
• C. Glycine
• D. Tryptophan

Answer 1

The correct option is B

Tyrosine

The correct solution is option B.

Explanation for correct option:

1. The amino acid tyrosine acts as a precursor for hormones thyroxine, adrenaline, and melanin.
2. Tyrosine is a non-essential amino acid.

Explanation for incorrect option:

Option A:

1. Proline maintains mammalian collagen synthesis.

Option C:

1. Glycine is a precursor for creatinine and glutathione.

Option D:

1. Tryptophan is a precursor for the monoaminergic neurotransmitter serotonin.

Final answer: Hormones thyroxine, adrenaline, and the pigment melanin are formed from Tyrosine.