West Virginia Barber Written Practice Exam

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What are the slender hair like extensions used by bacilli and spirilla for locomotion?

Cilia
Flagella
Pili
Villi

The correct answer is: Cilia

Cilia are slender hair-like extensions used by bacilli and spirilla for locomotion. Cilia are short, numerous projections that beat in a coordinated fashion, allowing the bacterial cells to move through liquid environments. Flagella are also used for locomotion in bacteria, but they are long whip-like structures instead of slender hair-like extensions. Pili are hair-like structures used for attachment, not locomotion. Villi are finger-like projections found in the lining of the small intestine, not used by bacteria for locomotion.