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Which of the following amino acids is basic in nature?

  1. ALysine
  2. BAspartic acid
  3. CValine
  4. DGlutamic acid

Answer: A

Lysine has two amino groups and one carboxyl group (the side chain ends in ), so it is basic. Aspartic and glutamic acids have two carboxyl groups and are acidic; valine is neutral.
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