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Question

The amino acid tyrosine is the precursor for the synthesis of
(i) Melatonin
(ii) Triiodothyronine
(iii) Thyroxine
(iv) Calcitonin


A
i and ii
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B
ii and iii
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C
iii and iv
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D
i and iv
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Solution

The correct option is B ii and iii
The amino acid tyrosine is a precursor of the thyroid hormones triiodothyronine or T3 and tetraiodothyronine or thyroxine or T4.

The precursor of melatonin is the amino acid tryptophan. Melatonin, triiodothyronine, and thyroxine are small organic molecules.

Calcitonin is a much larger molecule. It is a peptide of 32 amino acids.

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