Streptomyces belongs to the class of actinomycetes, which are strict aerobes, non-pathogenic and bear the nonmotile conidia. Streptomyces produces a volatile substance i.e. geosmin which gives an odor of moist soil.

Treponema palladium is an example of the spirochete, which causes syphilis. Spirochetes are gram-negative, helical shape, and chemoheterotrophic bacteria which exhibit creeping or crawling movements.

Cyanobacteria are gram-negative, oxygenic photosynthetic organisms. It can reproduce by binary fission as well as budding and multiple fission.