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MCAT Question A Day - 6/24/14 - Answer!

Which of the following is true of all steroids?

A.  The target cells of any steroid include every cell in the body.
B.  Steroids bind to receptor proteins on the membrane of their target cells.
C.  Steroids are synthesized on the rough endoplasmic reticulum.
D.  Steroids are lipid soluble.

D is correct. Steroids are lipid soluble. Different steroids may have different target cells. For instance, estrogens are very selective while testosterone affects every, or nearly every, cell in the body. Steroids act at the transcription level in the nucleus, and are synthesized by the smooth endoplasmic reticulum.