1. Amino Acids

• Amino Acids Share Common Structural Features

• The Amino Acid Residues in Proteins Are l Stereoisomers

• Amino Acids Can Be Classified by R Group

• BOX 3-1 Absorption of Light by Molecules: The Lambert-Beer Law

• Uncommon Amino Acids Also Have Important Functions

• Amino Acids Can Act as Acids and Bases

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• Amino Acids Differ in Their Acid-Base Properties