TLS Online TPP Program

#Question id: 160


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

#Unit 1. Molecules and their Interaction Relevant to Biology
  1. alanine; is a simple methyl group

  2. glycine; is a hydrogen atom

  3. glycine; is unbranched

  4. lysine; contains only nitrogen