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#Question id: 160


Of the 20 standard amino acids, only ___________ is not optically active.  The reason is that its side chain ___________.

#XL - T Zoology
  1. alanine; is a simple methyl group

  2. glycine; is a hydrogen atom

  3. glycine; is unbranched

  4. lysine; contains only nitrogen


Answer:- Option(s): 2


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