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MCAT Question A Day - 6/22/14 - Answer!

Which of the following is true for all endocrine hormones?

A.  They act through a second messenger system.
B.  They bind to a protein receptor.
C.  They dissolve in the blood.
D.  They are derived from a protein precursor.

B is correct. All hormones bind to a protein receptor, whether at the cell membrane, in the cytoplasm, or in thnucleus of the cell. Steroids and thyroxine require a transport protein to dissolve in the aqueous solution of the blood. Steroids are derived from cholesterol, not protein precursors.