Proteins: Structure and Functions · NCERT Biology

In the 'Primary Structure' of a protein, the first amino acid is also called as:

  1. C-terminal amino acid
  2. N-terminal amino acid
  3. R-terminal amino acid
  4. Alpha-terminal amino acid
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Correct answer: N-terminal amino acid

By convention, the first amino acid in a polypeptide chain is the N-terminal amino acid because its amino group is free. The last amino acid is the C-terminal amino acid.

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