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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