Multiple Choice
The primary source of energy in the cells is a nutrient called ________.
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1. Introduction to Biochemistry
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Which element is essential for the synthesis of the thyroid hormones triiodothyronine (T$_3$) and thyroxine (T$_4$)?
A
Iodine
B
Calcium
C
Iron
D
Magnesium
Verified step by step guidance1
Understand the role of thyroid hormones: Triiodothyronine (T$_3$) and thyroxine (T$_4$) are hormones produced by the thyroid gland that regulate metabolism, growth, and development.
Identify the chemical composition of T$_3$ and T$_4$: Both hormones contain iodine atoms as a critical component. T$_3$ has three iodine atoms, while T$_4$ has four iodine atoms.
Recognize the essential element: Iodine is required for the synthesis of these hormones because it is incorporated into their structure during hormone production in the thyroid gland.
Eliminate incorrect options: Calcium, iron, and magnesium are important for other biological functions but are not involved in the synthesis of thyroid hormones.
Conclude that iodine is the correct answer: Iodine is the essential element for the synthesis of thyroid hormones T$_3$ and T$_4$.
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