Why Does Testosterone, a Lipid-Soluble Signaling Molecule That Crosses the Membranes

question 15

Multiple Choice

Why does testosterone, a lipid-soluble signaling molecule that crosses the membranes of all cells, affect only target cells?

• A) Only target cells retain the appropriate genes regulated by testosterone.
• B) Intracellular receptors for testosterone are present only in target cells.
• C) Only target cells possess the cytosolic enzymes that transduce the signal from testosterone to adenylyl cyclase.
• D) Only in target cells is testosterone able to initiate the phosphorylation cascade leading to activated transcription factor.

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Definitions:

Acromegaly

A chronic condition characterized by enlargement of bones of the extremities and some bones of the head; thickening of facial soft tissues.

Cartilaginous

Pertaining to or composed of cartilage, a flexible connective tissue found in various parts of the body.

Connective Tissue

Biological tissue that supports, connects, or separates different types of tissues and organs in the body, consisting of cells embedded in a considerable amount of extracellular matrix.

Tetany

Intermittent tonic spasms resulting from inadequate parathyroid hormone.