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 the nucleus 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.
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B is correct. All hormones bind to a protein receptor, whether at the cell membrane, in the cytoplasm, or in the nucleus 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.
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