MacConkey agar is selective for Gram-negative bacteria and differential for lactose-fermenting bacteria. Blood agar is a nutritive medium, differential for hemolysis. Based on what you know about the candidates on the wall screen, which type of differential medium will give you the most information? a) Blood agar b) MacConkey agar
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MacConkey agar is an example of a medium that is which of the following? Choose one or more: A) selective for Gram-negative bacteria B) selective for Gram-positive bacteria C) enriched with blood to support selected human pathogens D) differential based on ability to ferment lactose E) differential based on ability to ferment mannitol F) general purpose (suitable for Gram-negatives and Gram-positives)
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MacConkey agar: All of the following are true of MacConkey Agar except for: selective for Gram-positive organisms, helps to differentiate lactose fermenting gram-negative rods from non-lactose fermenting gram-negative rods. It is primarily used for the detection and isolation of members of the family Enterobacteriaceae and Pseudomonas spp. Crystal violet and bile salts are incorporated in MacConkey agar to prevent the growth of Gram-positive bacteria.
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