Question

Microbes are often identified using biochemical tests that detect specific enzymes of metabolic pathways.

e.coli typically ferments lactose, whereas the dysenterybacterium, shigella, does not. if a pure culture of each bacterium were placed in a tube containing lactose as the only food source, and a chemical indicator changed color if the tube became acid, what would the tubes look like after the bacteria were incubated?

Answer 1

Hi there,

the answer to your question is: The tube with E. coli would indicate a pH change, and the Shigella tube would indicate no change.

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