Lack of motility is characteristic of which organism among Enterobacteriaceae?

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Multiple Choice

Lack of motility is characteristic of which organism among Enterobacteriaceae?

Explanation:
Motility varies among Enterobacteriaceae, and Klebsiella species are classically nonmotile due to the absence of flagella. This lack of movement helps distinguish Klebsiella oxytoca from other members of the family that have flagella and are motile. In practice, a motility test shows nonmotility as the culture stays confined to the inoculation line, whereas motile organisms spread through the medium. The other organisms listed (Enterobacter cloacae, Morganella morganii, Providencia stuartii) are typically motile, so their colonies spread in semi-solid media, contrasting with Klebsiella oxytoca.

Motility varies among Enterobacteriaceae, and Klebsiella species are classically nonmotile due to the absence of flagella. This lack of movement helps distinguish Klebsiella oxytoca from other members of the family that have flagella and are motile. In practice, a motility test shows nonmotility as the culture stays confined to the inoculation line, whereas motile organisms spread through the medium. The other organisms listed (Enterobacter cloacae, Morganella morganii, Providencia stuartii) are typically motile, so their colonies spread in semi-solid media, contrasting with Klebsiella oxytoca.

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