Steroid hormones bind to receptors inside the cell and alter their conformation. The hormone-receptor complex is then transported into the nucleus, where it can directly affect gene expression. To get from the location where the receptor binds the hormone to its site of action, the receptor-hormone complex must (circle one):
a) become water soluble by binding to a carrier molecule.
b) enter the smooth endoplasmic reticulum.
c) be transported through the nuclear pore complex.
d) undergo another conformational change.