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JEE Main levelSingle correct optionDifficulty 2 of 3bm264

Which residue is the N-terminal residue of the dipeptide shown?

  1. AGlycine, because its alpha-amino group is free
  2. BSerine, because its alpha-amino group is free
  3. CSerine, because its carboxyl group is free
  4. DGlycine, because it has no side chain

Answer: B

The N-terminal residue is the one whose alpha-NH2 group is not part of a peptide bond. In the drawing this is serine (NH2 on the serine alpha carbon), and glycine carries the free COOH, so it is the C-terminal residue. The dipeptide is Ser-Gly.
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