Spirilla are bacteria with which shape?

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Multiple Choice

Spirilla are bacteria with which shape?

Explanation:
Bacteria are grouped by their shape, and spirilla specifically describe a spiral form. The name spirillum (plural spirilla) comes from their visible spiraled, corkscrew-like appearance under a microscope, which is why spiral is the best descriptor. In contrast, spherical bacteria are cocci, rod-shaped ones are bacilli, and “wavy” isn’t a formal bacterial shape classification; some bacteria that look spiral are actually spirochetes, which are usually longer and more flexible than spirilla.

Bacteria are grouped by their shape, and spirilla specifically describe a spiral form. The name spirillum (plural spirilla) comes from their visible spiraled, corkscrew-like appearance under a microscope, which is why spiral is the best descriptor. In contrast, spherical bacteria are cocci, rod-shaped ones are bacilli, and “wavy” isn’t a formal bacterial shape classification; some bacteria that look spiral are actually spirochetes, which are usually longer and more flexible than spirilla.

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