Which among the following are “Spirochetes”?

A. Streptomyces sp.

B. Treponema pallidum

C. Spirillum volutans

D. Corynebacterium diphtheriae

Explanation: Spirochetes are flexible and can twist and contort their shape, whereas spirilla are relatively rigid. Treponema pallidum belongs to the spirochetes group and Spirillum volutans belong to the spirilla group.

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