Refer to the figure showing the thyroid gland. 
A person with a diet deficient in iodine can develop a goiter.At what point in the figure would the person's production of thyroxine be halted, and what would the consequence be?
Definitions:
Pyruvate
A key intermediate compound in cellular respiration and metabolism, resulting from the glycolysis of glucose.
Acetyl CoA
Acetyl CoA is a central metabolite in energy metabolism, acting as a substrate for the citric acid cycle and involved in the synthesis and oxidation of fatty acids.
Citric Acid Cycle
A sequence of biochemical processes that all oxygen-using organisms employ to produce energy by converting acetate, obtained from carbohydrates, fats, and proteins, into carbon dioxide.
Acetyl Group
A 2-carbon group derived from acetic acid (acetate).
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