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Differential media contain all of the following EXCEPT

  • A.Basal medium
  • B.Substances that inhibit microorganisms
  • C.Sugar concerned
  • D.Indicator

Answer: B

Correct answer: Substances that inhibit microorganisms

A differential medium contains a basal medium, the substrate in question (often a sugar) and an indicator to reveal what has been done to it - it lets everything grow and tells the colonies apart. Inhibitory substances belong to a selective medium, whose purpose is the opposite: to stop unwanted organisms growing at all.

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