Which one of the following is not an amino acid:

Correct answer: D. Aniline

  • A. Alanine
  • B. Glycine
  • C. Aspartic acid
  • D. Aniline

Explanation

Aniline is not an amino acid. It is an organic compound consisting of a benzene ring with an amino group (-NH2) attached to it. While it contains an amino group, it lacks a carboxylic acid group, which is a defining characteristic of amino acids.

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