Question

multiple choice question a medium that works by showing the reaction types, such as a color change in some colonies but not in others is called an______ medium. options: restricted, differential, normal, selective

Explanation:

To solve this, we analyze the definitions:

• Enriched medium: Adds nutrients to support growth of fastidious organisms, not about showing reaction types.
• Differential medium: Allows to distinguish between different types of microorganisms (or substances) by showing different reaction types (like color change in some colonies but not others).
• Normal medium: Not a standard term for this context.
• Selective medium: Inhibits growth of some organisms to select for others, not about showing reactions.

So the correct term is differential.

Answer:

B. differential (assuming the option with "differential" is the correct one; based on the analysis, the correct option is the one labeled with "differential")