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MCAT Question A Day - 9/20/14 - Answer!

Hydroxyapatite is the mineral portion of bone. Hydroxyapatite contains all of the following elementexcept:

A.  calcium
B.  sulfur
C.  phosphate
D.  hydrogen

B is correct. Hydroxyapatite is made up of calcium and phosphate in a compound that includes hydroxyl groups as well. You should know that bone acts as a storage place for phosphate and calcium. The hydroxyl you can get from the name.

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