In a carbohydrate fermentation test, how do you know if the bacteria fermented the carbohydratein...

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In a carbohydrate fermentation test, how do you know if the bacteria fermented the carbohydratein the medium?The pH increases when bacteria ferment the carbohydrate and the pH indicator turns redThe medium turns yellow AND gas is collected in the tubeThe medium turns yellow with or without gas productionBacteria grow on the surface of the medium where there is more oxygen for fermentation

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