Water is sometimes called the 21st amino acid because of its importance in defining protein structure. The basis for this is the so-called hydrophobic effect. Which of the following BEST describes the hydrophobic effect?
A) all of the choices are correct
B) Polar regions of the protein are repelled by water, driving them to the interior of the protein
C) water and the protein arrange themselves so that the nonpolar surface in contact with water is maximized
D) Non-polar regions of the protein are repelled by water, driving them to the interior of the molecule
Ans: D) Non-polar regions of the protein are repelled by water, driving them to the interior of the molecule
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