Steroid hormones
a) bind to receptors in the nucleus of their target cells.
b) are proteins.
c) are transported in the blood dissolved in the plasma.
d) cannot diffuse through cell membranes.
e) remain in circulation for relatively short periods of time.

A) bind to receptors in the nucleus of their target cells.

Explanation:

Steroid hormones are synthesized from cholesterol and are lipids, therefore they cannot be transported in the blood dissolved in the plasma. They are associated with transport proteins to travel in blood.

Because they are lipids, they can diffuse through cell membranes, and once inside the target cell they bind to receptors in the cytoplasm or the nucleus and alter gene expression.