Arkansas Esthetician Practice Exam

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Bacilli and spirilla move themselves by using what type of projections?

Cilia
Flagella
Fimbriae
Pili

The correct answer is: Flagella

Bacilli and spirilla use their flagella for motility. Cilia is a short, hair-like projection used for movement in other organisms, such as protozoa. Fimbriae are small, bristle-like fibers used for attachment to surfaces. Pili are also used for attachment, but they are longer and thicker than fimbriae and are also used for transfer of genetic material between bacteria. Therefore, options A, C, and D are incorrect because they are not the main type of projections used for movement in Bacilli and spirilla.