The general structural formula of $\alpha$-amino acid is $NH_2-CH(R)-COOH$. The group $R$ in tryptophan $(X)$ and histidine $(Y)$ are respectively:

  • A
    $X$: Indolyl-methyl group; $Y$: Imidazolyl-methyl group
  • B
    $X$: Indolyl-ethyl group; $Y$: Imidazolyl-ethyl group
  • C
    $X$: Indolyl-methyl group; $Y$: Imidazolyl-ethyl group
  • D
    $X$: Indolyl-ethyl group; $Y$: Imidazolyl-methyl group

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Match List-$I$ with List-$II$
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Choose the correct answer from the options given below :-

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