Which is true about Enterobacteriaceae: (A) All are oxidase negative, (B) Nitrate reduction negative, (C) Glucose not fermented by all, (D) Motility by polar flagellum
Answer is A. They are motile by peritrichous flagella, ferments glucose producing acid, reduces nitrates to nitrites, but forms catalase, not oxidase. They are non-sporing, non-acid, Gram-negative bacilli that are found in the gut of man and animals. Reference: Textbook of Microbiology; Anathanarayan and paniker's; 10th edition; Page no: 279