Question

Which of the following hormones contain iodine?
A. Inhibin
B. FSH
C. Prolactin
D. Thyroxine

Answer 1

There are different types of a hormone-like peptide hormone, proteinous hormone, the amino-acid hormone released by the endocrine glands. The hormones like iodothyronine contain iodine.

Complete answer:
In every cell of the body, thyroid hormones act with their own special mediated functions. Increases in basal metabolic rate, affect protein synthesis, help regulate long bone growth and neural maturation, and increase the body's sensitivity to catecholamines such as adrenaline are the main important functions of the Thyroid releasing hormones from the thyroid gland.

The proper development and differentiation of all cells of the human body are also the main important key functions. By the follicular cells of the thyroid gland and are regulated by TSH made by the thyrotropes of the anterior pituitary gland thyroid hormones are released. ${T_3}$ effects are mediated by the ${T_4}$ that happens in an In-vivo manner.

Follicular cells of the thyroid gland produce thyroxine which is produced as the precursor thyroglobulin and is cleaved completely by enzymes to produce active ${T_4}$. The thyroglobulin protein present in the thyroid gland accounts for approximately half of the protein content hormones in the gland. Approximately 100–120 tyrosine residues are present in the thyroglobulin molecule. A small number of molecules are subjected to iodination catalyzed by thyroperoxidase.

The same enzyme then catalyzes the "coupling" of one modified tyrosine with another, via a free-radical-mediated reaction, and when these iodinated bicyclic molecules are released by hydrolysis of the protein, ${T_3}$ and ${T_4}$ are the results. So, that each thyroglobulin protein molecule yields very small amounts of thyroid hormone ultimately in the body.

Hence, the correct option is (D), i.e., Thyroxine

Note: Thyroglobulin is a dimeric protein that is produced by the follicular cells of the thyroid and is used entirely within the thyroid gland with 660 daltons. Thyroxine is produced by the mechanism of attaching iodine atoms to the ring structures of this protein's tyrosine residues; Four iodine atoms are present in thyroxine (${T_4}$) while triiodothyronine (${T_3}$), is identical to ${T_4}$, that has one less iodine atom per molecule.