Thyroxine and Tri-iodothyronine, produced by the thyroid gland, are synthesised from iodine and ___________.

Phenylalanine

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Tyrosine

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Tryptophan

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Cholesterol

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Solution

The correct option is B Tyrosine
Iodine ions are added to amino acids Tyrosine in presence of enzyme thyroperoxidase, forming monoiodothyrosine (MIT) and di iodothyrosine (DIT). Later MIT and DIT combine to form T $_{3}$ tri iodothyroxine, while two DIT combine to form T $_{4}$ .
So, the correct answer is 'Tyrosine'

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Similar questions

Q. One of the following statements is not true about thyroxine. This is :
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(d) Thyroid gland can enlarge due to lack of thyroxine

Question 26
Which statement is not true about thyroxin?

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