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MCAT Question A Day - 7/12/13 - Answer!

Osteoblasts must synthesize

A.  proteins.
B.  carbohydrates.
C.  inorganic material.
D.  All of the above

The correct answer is (D). Osteoblasts make bone tissue, which includes protein (collagen), inorganic calcium salts (hydroxyapatite), and a carbohydrate matrix (mucopolysaccharides).