28. Which of the following microorganisms will be positive for the citrate test?

Question

28. Which of the following microorganisms will be positive for the citrate test? a. Enterolracter aerogenes e. Pseudomonas aeruginosa b. E coll d. none of the above 29. Cytochrome oxidase occurs in a. bacteria that carry out fermentation b. bacteria that carry out oxidation e. Pseudomonave, b and c d, a and b 30. Hydrogen peroxide is a highly reactive oxidizing agent that can damage essential molecules in t bacterial cell. To avoid this damage, aerobes produce the enzyme a. catalase b. deaminase c, lipase d. caseinase 31. The enzyme nitrate reductase catalyzes a the transfer of electron from cytochrome b to nitrate, reducing it to nitrite b. the transfer of electron from nitrate to cytochrome b c. the transfer of electron from cytochrome b to nitrite, reducing it to nitrate d. none of the above transfers 32. The degradation of tryptophan by the bacterial enzyme tryptophanase can be detected with a. Barritt's reagent A and B c. 10% ferric chloride d. zinc dust e, Kovac's reagent b. Gram's iodine 33. Which of the following Gram negative enteric bacteria is'are urease positive? a. Proteus c. Morganella e none of the above

Explanation / Answer

28) Which of the following microorganisms will be positive for the citrate test?

A) Enterobacter aerogenes

29) Cytochrome oxidase occurs in

C) Pseudomonase, b and c

30) To avoid the damage from hydrogen peroxide, bacteria produce the enzyme:

A) Catalase

31) The enzyme nitrate reductase catalyzes:

A) The transfer of electron from cytochrome b to nitrate, reducing it to nitrite.

32) The degradation of tryptophan by the bacterial enzyme tryptophanase can be detected with:

E) Kovac's reagent

33) Which of the following Gram negative enteric bacteria is/are urease positive?

A) Proteus

C) Morganella

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