Side-by-Side Images of Amino Acids

Left Frame:

Right Frame:

Amino Acid Side Chain PolarityPolarity Color Bar
The colors shown above are used to highlight the dot surface of the amino acid R-groups when the "Polarity" button is clicked. Sidechain polarity is measured as the relative solubility of the R-groups in organic vs aqueous solvents. At neutral pH, the range is about 1000-fold. The divisions marked above correspond to 10-fold differences on this scale from the most hydrophobic (tryptophan) to the most hydrophilic (arginine) amino acid. (Put the mouse over the other colors for a complete list in the window status bar.)
The "Reset" button will return the display to the starting colors and orientation.
Ready for a practice quiz on the amino acids?
Identify the amino acids by name, abbreviation, and/or one-letter code
(with grading and correction of your answers):
Amino Acid Identification Quiz.
Back to Molecular Models for Biochemistry at CMU.
Dr. William McClure
wm0p@andrew.cmu.edu.
Department of Biological Sciences
Carnegie Mellon University

Last modified March 6, 2002.