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Which of the following does not contain protein?

  • A.Pili
  • B.Flagellum
  • C.Lipoteichoic acid
  • D.Porin

Answer: C

Correct answer: Lipoteichoic acid

Lipoteichoic acid is a polymer of glycerol phosphate with a lipid anchor - no protein at all. Pili and flagella are built from protein subunits (pilin and flagellin), and porins are proteins by definition.

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