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MCAT Question A Day - 8/6/13 - Answer!

The basic monomers for synthesizing carbohydrates include

A.  glucose, lactose, and glycerol.
B.  glucose, lactose, and sucrose.
C.  glucose, fructose, and glycogen.
D.  glucose, galactose, and fructose.

The correct answer is (D). Glucose, galactose, and fructose are all carbohydrate monomers (monosaccharides), whereas lactose and sucrose are disaccharides; glycerol is a building block for synthesizing triglycerides (fats); and glycogen is already a large polysaccharide carbohydrate.