Question:
Which of the following is a selective medium for Gram-negative bacteria?
Which of the following is a selective medium for Gram-negative bacteria?
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Remember that MacConkey agar is selective for Gram-negative bacteria and differentiates them based on lactose fermentation.
Updated On: Jun 18, 2025
- MacConkey agar
- Chocolate agar
- Blood agar
- Nutrient agar
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The Correct Option is A
Solution and Explanation
MacConkey agar is a selective medium that inhibits the growth of Gram-positive bacteria and supports the growth of Gram-negative bacteria. It also differentiates bacteria based on lactose fermentation. Chocolate agar and blood agar are enriched media that support the growth of a variety of organisms, not just Gram-negative bacteria. Nutrient agar is a general-purpose medium and is not selective.
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