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GATE2020: 16

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A microorganism isolated from a salt-rich (salt concentration $\sim2$ $M$) lake was found to possess diglycerol tetraethers, with polyisoprenoid alcohol side chains, as the major lipid component of its cell membrane. The isolated organism is

  1. a planctomycete
  2. a cyanobacteria
  3. a unicellular amoeba
  4. an archaea

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