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Mayonnaise resists bacterial growth largely because of its

  • A.acidity from added vinegar or lemon juice
  • B.high content of unsaturated fat
  • C.storage in a sealed opaque jar
  • D.content of raw egg yolk

Answer: A

The acetic or citric acid brings the pH low enough to prevent growth, and commercial mayonnaise made with pasteurised egg is a stable product. Trouble arises when it is diluted into a salad, which raises the pH and adds nutrients.

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