Question

Which pair of following Enterobacteriaceae representatives are Lactose Fermenters?

A. Pseudomonas and Shigella

B. Salmonella and Shigella

C. Proteus and E. coli

D. E. coli and Enterococcus

E. None of the above

Answer 1

Enterobacteriales are facultatively anaerobic, gram-negative, rod-shaped bacterium. If motile, they are peritrichously flagellated. ( flagella all over the surface of the bacterium). They are also called as enterics because they commonly habitat the intestine of humans and other animals. Most enterics is active fermenters of glucose and other carbohydrates.

The answer is option D.

From the options, only E.coli and Enterococcus are fermenters of lactose.

Pseudomonas, Shigella, Proteus and Salmonella are non-lactose fermenters.