Identify the $N$-terminal and $C$-terminal $\alpha$-amino acids respectively in the following polypeptide fragment: $Ala-Gly-Ser-Tyr-Gly$.

  • A
    $Gly$ and $Tyr$
  • B
    $Gly$ and $Gly$
  • C
    $Ala$ and $Ser$
  • D
    $Ala$ and $Gly$

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