Thyroxine Is a Peptide Hormone, but Its Mechanism Is Different

question 103

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 does not require a second messenger to cause a response.
• C) It causes positive feedback.
• D) It is very specific in the cell type it targets.

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