Which of the following organisms is negative for catalase, indole, and arginine dihydrolase tests and pits the agar on a sheep blood agar plate?
a. E. corrodens
b. W. virosa
c. P. maltophilia
d. S. paucimobilis
A
E. corrodens can be recognized in culture by its bleachlike odor. The organism does not utilize glucose or other carbohydrates and is catalase-negative. However, it reduces nitrate to nitrite and hydrolyzes both ornithine and lysine and pits the agar on a sheep blood plate.
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Which of the following acts as an emulsifier?
a. lipase b. amylase c. bile d. trypsin
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