111.
Polyisoprenoid branched-chain lipids are present in which of the following?
Answer: A
Correct answer: Archaebacteria
Archaea have membranes quite unlike anyone else’s: branched polyisoprenoid chains linked to glycerol by ether bonds rather than the straight fatty acids and ester bonds of bacteria and eukaryotes. Ether bonds and branched chains are far more stable, which is part of how the extreme thermophiles and acidophiles among them survive.
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