Question

multiple choice question
a medium that works by showing two reaction types, such as a color change in some colonies but not in others is called a(n) ______ medium.

○ enriched
○ differential
○ minimal
○ selective

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Explanation:

To solve this, we analyze each option:

• Enriched medium: Adds nutrients to support growth, not for showing different reactions.
• Differential medium: Allows distinguishing between different microorganisms by showing different reactions (like color change in some colonies).
• Minimal medium: Contains basic nutrients, not for differentiation.
• Selective medium: Inhibits some microbes, promotes others, not for showing different reactions.

So the correct option is differential.

Answer:

B. differential