You are presented with the quiz "Thyroxine increases the rate of metabolism in cells throughout the what?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "thyroid hormones increase the rate of metabolism in cells throughout the body" and "thyroxine, a thyroid hormone, is an aryl iodide". 

So, what's the best answer to the question?


 

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