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

question 19

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

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