Thyroxine Is a Peptide Hormone,but Its Mechanism Is Different from Other

question 25

Multiple Choice

Thyroxine is a peptide hormone,but its mechanism is different from other peptide hormones.Which of the following statements is true concerning this difference?

• A)It is a stimulant of cellular metabolism and targets all cells.
• B)It causes positive feedback.
• C)It is very specific in the cell type it targets.
• D)It does not require a second messenger to effect a response.

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