Thyroxine is a thyroid hormone that is involved in regulation of metabolic rate - higher thyroxine levels result in higher metabolic rate. Thyroxine is an amine hormone, and it is lipid soluble. Which of these statements about thyroxine is true?     Thyroxine cannot cross cell membrane     Thyroxine has high solubility in blood     Thyroxine can only have membrane-bound receptors     Thyroxine can diffuse across a membrane and bind a receptor in the cell nucleus

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