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.