Basic (Polar)

If the side chain contains an amine functional group, the amino acid produces a basic solution because the extra amine group is not neutralized by the acid group. Amino acids which have basic side chains include: lysine, arginine, and histidine.

Amino acids with an amide on the side chain do not produce basic solutions i.e. asparagine and glutamine.

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Structure of Amino Acids
Amino Acid Properties

Classes of Amino Acids
Amino Acid Disorders Screening
Functions and Non-functions in proteins