Question:
One of the following is NOT a thyroid hormone. It is ______________.
One of the following is NOT a thyroid hormone. It is ______________.
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T$_3$ and T$_4$ are iodine-containing derivatives of tyrosine.
Updated On: Mar 28, 2026
- thyrocalcitonin
- tyrosine
- triiodothyronine
- tetraiodothyronine
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The Correct Option is B
Solution and Explanation
Step 1: Understanding thyroid hormones.
The thyroid gland secretes thyroxine (T$_4$), triiodothyronine (T$_3$), and thyrocalcitonin.
Step 2: Nature of tyrosine.
Tyrosine is an amino acid and serves as a precursor for thyroid hormone synthesis.
Step 3: Differentiation.
Although tyrosine is required to form thyroid hormones, it is not itself a hormone.
Step 4: Conclusion.
Hence, tyrosine is not a thyroid hormone.
The thyroid gland secretes thyroxine (T$_4$), triiodothyronine (T$_3$), and thyrocalcitonin.
Step 2: Nature of tyrosine.
Tyrosine is an amino acid and serves as a precursor for thyroid hormone synthesis.
Step 3: Differentiation.
Although tyrosine is required to form thyroid hormones, it is not itself a hormone.
Step 4: Conclusion.
Hence, tyrosine is not a thyroid hormone.
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