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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