Which statement about Yersinia pestis is correct?

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Multiple Choice

Which statement about Yersinia pestis is correct?

Explanation:
Biochemical profiling helps identify Yersinia pestis by its enzyme activities. Y. pestis does not hydrolyze urea, so it is urease negative. In a urease test, there is no rapid color change to pink, indicating the absence of urease activity. This trait helps distinguish it from urease-positive relatives such as Proteus and Klebsiella. Other statements don’t fit: Y. pestis does not produce hydrogen sulfide, it is nonmotile across typical lab temperatures (not motile at 20–25°C), and it is oxidase negative (not oxidase positive). Therefore, urease negativity is the characteristic that matches Yersinia pestis.

Biochemical profiling helps identify Yersinia pestis by its enzyme activities. Y. pestis does not hydrolyze urea, so it is urease negative. In a urease test, there is no rapid color change to pink, indicating the absence of urease activity. This trait helps distinguish it from urease-positive relatives such as Proteus and Klebsiella. Other statements don’t fit: Y. pestis does not produce hydrogen sulfide, it is nonmotile across typical lab temperatures (not motile at 20–25°C), and it is oxidase negative (not oxidase positive). Therefore, urease negativity is the characteristic that matches Yersinia pestis.

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