Which one of the following structures represents the peptide chain?

  • A
    $-NH-CH(R)-CO-NH-CH(R)-CO-NH-CH(R)-CO-$
  • B
    $-NH-CH(R)-CH_2-CO-NH-CH(R)-CH_2-NH-CO-CH(R)-CH_2-$
  • C
    $-NH-CO-NH-CH(R)-NH-CO-NH-$
  • D
    $-NH-CO-CH_2-CH_2-CH_2-NH-CH_2-CH_2-CH_2-$

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