Question

Why is macconkey agar selective as well as differential?

Answer 1

Answer:

MacConkey's medium is a selective medium that inhibits the growth of Gram positive organisms due to the presence of crystal violet and bile salts. MacConkey's medium is also a differential medium,since it can distinguish between groups of bacteria on the basis of a color change reaction.

Answer 2

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MacConkey Agar (MAC) is a selective and differential medium designed to isolate and differentiate enterics based on their ability to ferment lactose. Bile salts and crystal violet inhibit the growth of Gram positive organisms. Lactose provides a source of fermentable carbohydrate, allowing for differentiation...

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