What is the most likely mechanism by which testosterone functions inside a cell?
A) It acts as a signal receptor that activates tyrosine kinases.
B) It binds with a receptor protein that enters the nucleus and activates expression of specific genes.
C) It acts as a steroid signal receptor that activates ion channel proteins in the plasma membrane.
D) It coordinates a phosphorylation cascade that reduces spermatogenesis.

Question

Quizplus · Accepted Answer

Testosterone is a steroid hormone and is known to bind to intracellular receptors. These receptors are found in the cytoplasm and upon binding, they translocate to the nucleus and bind to specific DNA sequences called hormone response elements (HREs). Binding of the hormone-receptor complex to the HREs results in the activation of gene expression, leading to the biological effects of testosterone.

What Is the Most Likely Mechanism by Which Testosterone Functions