Which of the following can act on receptors inside the target cell that directly activate specific genes?
A) growth hormone
B) melatonin
C) testosterone
D) calcitonin

Question

Quizplus · Accepted Answer

Testosterone is a steroid hormone that can diffuse through the plasma membrane of the target cell and bind to receptors in the cytoplasm or nucleus. This complex can then bind directly to specific DNA sequences and activate certain genes, resulting in changes in the cell's function. The other hormones listed (growth hormone, melatonin, and calcitonin) typically act on receptors located on the cell membrane, which then initiate a signaling cascade within the cell.

Which of the Following Can Act on Receptors Inside the Target