Eosin-Methylene Blue Agar, or EMB, Is a Commonly Used Bacteriological

question 33

Multiple Choice

Eosin-methylene blue agar, or EMB, is a commonly used bacteriological medium for growing gram- negative bacteria from complex environments. It contains two dyes, eosin and methylene blue, as well as the sugar lactose. Eosin is a pH indicator that changes color when the medium is acidic, while methylene blue inhibits the growth of most gram-positive bacteria. If an organism consumes lactose, acid will be produced, causing the bacterial colonies to change color. based upon this description, this medium is ______.

• A) reducing
• B) differential and selective
• C) for enrichment
• D) selective
• E) differential

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