MacConkey Agar – Flashcards
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selective media creates..
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gram negative bacteria
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bile salts and crystal violet inhibit..
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growth of gram positive bacteria
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media is used for what?
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isolate and differentiate enterobacteriaceae (lactose fermenters-so they ferment the lactose in macconkey media
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what purpose does nutrient agar plate serve? what way does it increase the validity of the test results?
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gram negative will only grow on macconkey
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with respect to macconkey agar what would be the possible consequence of:
a. replacing lactose with glucose
b. replacing neutral red with phenol red
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a. there wouldn't be a differentiation
b. the acid producers would be yellow
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who would removing crystal violet from macconkey agar alter the sensitivity and specificity of the medium?
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gram positive will be able to grow crystal violet inhibits growth of gram positive
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compare the recipes of nutrient agar and macconkey agar if an organism can grow on both media on which would you expect it to grow better?
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best on nutrient agar because it provides lost of nutrients for the organism
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macconkey agar is a selective medium it is also a defined or an undefined medium why is that formulation desirable?
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undefined beneficial by giving wide variety of growth ability
