Microbiology The fermentation of lactose on EMB: Multiple answers: Multiple answers are accepted for this question. a. Acidifies the medium. b. Causes colonies to change color. c. Inhibits the growth of Gram-positive bacteria. d. Allows for the growth of Gram-negative bacteria.
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Acidifies the medium: When lactose-fermenting bacteria grow on EMB agar, they produce acidic byproducts, which lower the pH of the medium. So, this statement is true. b. Causes colonies to change color: EMB agar contains eosin and methylene blue dyes, which react Show more…
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After inoculating an organism to MacConkey agar and incubating, you observe growth, but the medium does not change color. What can you conclude about the organism? Choose ALL correct answers: a. The organism ferments lactose b. The organism is Gram-negative c. The organism is Gram-positive d. The organism does not ferment lactose
After inoculating an organism to MacConkey agar and incubating, you observe no growth or color change. What can you conclude about the organism? Choose ALL correct answers: a. The organism ferments lactose b. The organism is Gram-negative c. The organism does not ferment lactose d. The organism is Gram-positive
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