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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3bm275

Which of the following statements about the dipeptide shown is/are correct?

  1. AThe N-terminal residue is serine.
  2. BThe C-terminal residue is cysteine, whose stereocentre is R.
  3. CIt contains three stereocentres.
  4. DOne molecule of water is lost when it is formed from its two amino acids.

Answer: A, B, D

The residue with the free NH2 is serine (N-terminal) and the one with the free COOH is cysteine (C-terminal). The cysteine alpha carbon has R configuration (CH2SH outranks COOH). The dipeptide has two stereocentres, not three, and formation of its single peptide bond loses one water molecule.
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