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.

---

Definitions:

Anaerobic Respiration

is a form of respiration using electron acceptors other than oxygen. It often occurs in bacteria and in muscle cells.

Endomysium

A thin layer of connective tissue that surrounds each individual muscle fiber, providing structural support and facilitating the transmission of force.

Organelle

Specialized structures within a cell that perform specific functions necessary for the cell's life.

ATP Energy

The primary energy carrier in all living organisms, ATP (adenosine triphosphate) provides energy for various biological processes by releasing energy when it's broken down into ADP (adenosine diphosphate).