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MCAT Question A Day - 7/23/14 - Answer!

Which of the following is not true concerning the digestive products of dietary protein?

A.  They are used to synthesize essential amino acids in the liver.
B.  Some of the products are absorbed into the intestines by facilitated diffusion.
C.  Energy is required for the intestinal absorption of at least some of these products.
D.  Deamination of these products in the liver leads to urea in the blood.

A is correct. 'Essential' means that the body cannot synthesize them. Nonessential amino acids are synthesized by the liver. Amino acids are absorbed by facilitated and active transport. Urea is the end product of amino acid deamination in the liver.

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