Which one of the following statements is not correct?

  • A
    Except glycine,all other naturally occurring $\alpha$-amino acids are optically active.
  • B
    $\alpha$-amino acids have maximum solubility at their isoelectric point.
  • C
    $A$ tripeptide has two peptide bonds.
  • D
    $\alpha$-amino acids exist as Zwitter ions.

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