Tadpoles Undergo Metamorphosis in Their Development

question 45

Multiple Choice

Tadpoles undergo metamorphosis in their development. The changes include reabsorption of the tail, growth of limbs, and the development of lungs. Amazingly, all of these changes are induced by thyroxine. Which of the following best explains the diverse effects of thyroxine?

• A) Thyroxine binds to transport proteins that direct thyroxine to certain tissues.
• B) Different tissues have thyroxine receptors that activate different signal transduction pathways.
• C) Some tissues have membrane receptors for thyroxine, while other tissues have thyroxine receptors within the nucleus.
• D) Thyroid hormone is divided into T3 and T4 as it travels through the bloodstream.

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