A phenol red glucose broth with a Durham tube has been inoculated and incubated. After 48 hours, the broth is turbid and bright yellow and approximately half of the contents of the Durham tube contains bubbles. Interpret these results.
a. The organism will ferment lactose as well.
b. The organism is fermenting glucose.
c. The organism is an obligate anaerobe.
d. The organism is fermenting lactose and producing ethanol and CO2.
Answer: b. The organism is fermenting glucose.
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