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Teichoic acid present in Gram-positive bacteria can bind to which ion?

  • A.Fe ions
  • B.Phosphorus ions
  • C.Mg ions
  • D.Sulphur ions

Answer: C

Correct answer: Mg ions

Teichoic acids are polymers of glycerol or ribitol phosphate, so the wall carries a strong negative charge. That charge binds divalent cations, magnesium in particular, holding a reserve of them at the cell surface where the membrane enzymes need them.

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