Bacteria that are motile without possessing external flagella?

VMC-0074

QUESTION

Bacteria that are motile without possessing external flagella?

OPTIONS

(A) Vibrio
(B) Bacilli
(C) Streptococci
(D) Spirochetes

ANSWER

(D) Spirochetes

EXPLANATION

Spirochetes are highly motile bacteria that move by means of axial filaments/endoflagella located in the periplasmic space rather than external flagella visible on the cell surface. Therefore option D is correct; Vibrio and bacilli can possess external flagella, while streptococci are generally nonmotile.

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