Colorado Esthetician Written Practice Exam

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What kind of shape do Spirilla bacteria have?

  1. Spherical

  2. Rod-shaped

  3. Spiral or corkscrew-shaped

  4. Cluster-like

The correct answer is: Spiral or corkscrew-shaped

Spirilla bacteria are known for their unique spiral or corkscrew shape, giving them their name. This shape allows them to move efficiently through various environments, including liquid mediums. Spherical bacteria are known as cocci, rod-shaped bacteria are called bacilli, and cluster-like bacteria typically refer to staphylococci, which form grapelike clusters. However, in this case, Spirilla bacteria specifically have a spiral or corkscrew shape.

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