BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Iodine, as a trace element, is a necessary and limiting substrate for thyroid gland hormone synthesis. It is an essential element that enables the thyroid gland to produce thyroid hormones thyroxine (T4) and triiodothyronine (T3).

Detailed explanation-2: -Iodine is required for the synthesis of thyroxine by the thyroid gland. Deficiency of iodine in the diet causes hypothyroidism.

Detailed explanation-3: -One is called thyroxine; this hormone contains four atoms of iodine and is often called T4. The other is called triiodothyronine, which contains three atoms of iodine and is often called T3. In the cells and tissues of the body, the T4 is converted to T3.