The two subgroups of spirilla are which organisms?

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Multiple Choice

The two subgroups of spirilla are which organisms?

Explanation:
Spirilla include spiral-shaped bacteria, and a key subgroup of these are the spirochetes, which are flexible and move with axial filaments. Treponema pallidum and Borrelia burgdorferi are classic examples of spirochetes, the organisms behind syphilis and Lyme disease. Their slender, helical form and unique motility set them apart from other bacteria that may be curved or rod-shaped but are not spirilla. The other options are not spirilla because they are either curved rods or straight rods/cocci, not spiral-shaped.

Spirilla include spiral-shaped bacteria, and a key subgroup of these are the spirochetes, which are flexible and move with axial filaments. Treponema pallidum and Borrelia burgdorferi are classic examples of spirochetes, the organisms behind syphilis and Lyme disease. Their slender, helical form and unique motility set them apart from other bacteria that may be curved or rod-shaped but are not spirilla. The other options are not spirilla because they are either curved rods or straight rods/cocci, not spiral-shaped.

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