Which statement correctly completes the statement?
Except for glycine,which is achiral,all the amino acids present in proteins ......

  • A
    are chiral,but racemic
  • B
    have the $L$ configuration at their $\alpha$ carbon
  • C
    have the $R$ configuration at their $\alpha$ carbon
  • D
    have the $S$ configuration at their $\alpha$ carbon

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