Question

Eswrs Collece 15. The activity of the enzyme phenylalanine deaminase can be detected by using the follwing ragent A. 3% Hydrogen Peroxide B. 10% alpha Naphtol C. Nitrate reagents A and B D. Kovac's reagent E. None of the above Questions 16 through 20 refers to the cass Case Study: A fecal sample from a patient with diarrhea gave the following results: 16. Isolate produced colorless colonies after incubation on MacConkey agar. This resat means thar the siolated organism is A. Lactose fermenter B. Glucose fermenter C. Mannitol fermenter D. Non-glucose fermenter E. Non-lactose fermenter 17. After inoculation and incubation in Kligler's Iron agar, isolate produced red color on slant and yellow color at the bottom, as well as dispersed black precipitate. This result comfirms that bacterial isolate is... A. Lactose fermenter and glucose fermenter B. Lactose fermenter but non-fermenter of glucose C. Glucose fermenter but non-fermenter of lactose D. Non-fermenter of both lactose and glucose E. None of the above 18. Isolate was sub-cultured and incubated in SIM medium. The result was a dark dispersed precipitate. This result means that the isolate is A. positive for hydrogen sulfide production B. positive for motility C. positive for indole production D. positive for urease production E. both A and B are correct 19. Isolate also produced a yellow coloration after incubation in Uirease agar slant. This result mcans the isolate A. positive for lactose fermentation B. positive for indole production C. positive for urease activity D. negative for urease activity E. negative for methyl red test isolate from the fecal sample? A. Shigella flexneri 20. Based on the totality of the foregoing results, which of the folowing is the probable idenity of the bacterial C Proteus vulgaris D. Streptococcus faecinum E. Escherichia coli

Answer 1

15.C) nitrate reagent A and B

16.E) non lactose fermenter [if colour is pink then it is lactose fermenting organism ]

17.C) glucose fermenter but non fermenter of lactose [ black precipitate indicates hydrogen sulphide production ]

18.E) both A and B are correct

19.D) negative for urease activity

20.A) shigella flexneri