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Question

Which of the following is a derivative of amino acid?

A
Thyroxine
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B
Estradiol
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C
Estrone
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D
Progesterone
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Solution

The correct option is A Thyroxine
Thyroxine is a derivative of amino acid. Thyroid hormones (THs) -- thyroxine (T4) and tri-iodothyronine (T3) -- are iodinated derivatives of the amino acid tyrosine, which regulates growth, development and critical metabolic functions.

THs are taken up by target cells and act at the genomic level via nuclear thyroid receptors. Saturable transport mechanisms mediate the greater part of TH movement across the plasma membrane.

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