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What shape are spirilla bacteria?

  1. Round

  2. Spherical

  3. Spiral

  4. Straight

The correct answer is: Spiral

Spirilla bacteria are characterized by their distinctive spiral shape, which resembles a corkscrew or a spiral staircase. This morphology allows them to move more freely in fluids, enabling them to navigate through their environment effectively. The spiral form is a significant identifying factor for these types of bacteria, setting them apart from other shapes like cocci, which are round, or bacilli, which are rod-shaped. Understanding the shape of spirilla bacteria is essential in microbiology, particularly for identification and classification purposes.