Identify the following amino acid, and tell from the electrostatic potential map whether its side chain is acidic, basic, neutral nonpolar, or neutral polar.
STRATEGY
Identify the amino acid by looking at Figure 24.2, and predict its polarity by looking for electron-rich (red) or electron-poor (blue) regions in the side chain.
The amino acid is leucine. It is nonpolar because it contains a hydrocarbon side chain that has neither electron-rich nor electron-poor groups.