Consider a Culture Medium on Which Only Gram-Positive Organisms Such

question 50

Multiple Choice

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 a 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)

• A) selective and differential medium.
• B) differential medium.
• C) selective medium.
• D) enrichment culture.
• E) differential and enrichment culture.

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