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9 September, 10:38

If the chemical X-gal is added to nutrient agar, lactose fermenting colonies turn blue, while non-fermenting colonies appear white. What sort of medium is X-gal agar?

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  1. 9 September, 11:10
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    C. Differential.

    Explanation:

    Differential media are bacteriological growth media that contain specific ingredients to allow one to distinguish selected species or categories of bacteria by visual observation. Examples of differential media includes:

    Blood agar (used in strep tests) contains bovine heart blood that becomes transparent in the presence of β-hemolytic organisms such as Streptococcus pyogenes and Staphylococcus aureus.

    Eosin methylene blue is differential for lactose fermentation.

    Streptococcuseosin methylene blue (EMB), which is differential for lactose and sucrose fermentation.
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