elevated NaCl level. A yellow halo surrounds the growth, indicating the bacterium fermented sugar in the medium, decreasing the pH as a result and changing the color of a pH indicator chemical. This

Human Anatomy & Physiology (11th Edition)
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Chapter1: The Human Body: An Orientation
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).  Consider a culture medium on which only gram-positive organisms such as Staphylococcus aureus colonies can grow due to an elevated NaCl level. A yellow halo surrounds the growth, indicating the bacterium fermented sugar in the medium, decreasing the pH as a result and changing the color of a pH indicator chemical. This type of medium would be referred to as a(n):

  1. A) Selective medium.
  2. B) Differential medium.
  3. C) Enrichment culture.
  4. D) Selective and differential medium.
  5. E) Differential and enrichment culture.
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Answer D.

selective and differential medium

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