Question

Difference between lactose fermenting and non lactose fermenting bacteria

Answer 1

LACTOSE FERMENTERS (LF): Utilizing lactose to produce Acid and give low pH of agar <6.8 which give red/pink colonies, e.g.,Escherichia coli,Enterobacter, Klebsiella.

NON-LACTOSE FERMENTERS (NLF): Cannot utilize lactose; Use peptone to form ammonia and raises pH of agar which gives white/colorless colonies, e.g., Salmonella, Proteus, Shigella.

Answer 2

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Fermentation is a metabolic process that produces chemical changes in organic substrates through the action of enzymes. In biochemistry, it is narrowly defined as the extraction of energy from carbohydrates in the absence of oxygen.