The different amino acids have side chains that are classified into two major groups, the polar and nonpolar. Polar side chains are subclassified into polar charged and polar uncharged, while nonpolar side chains are subclassified into aliphatic and aromatic side chains.
Which of the following best describes the side chains of the nonpolar amino acids (glycine is not included)?
A. They are organic bases with a positive charge.
B. They are organic bases with a negative charge.
C. They are primarily neutral hydrocarbon structures.
D. They are ring structures.
E. They contain hydroxyl, carboxyl, or sulphydryl groups.
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