The type of bacteria that rarely shows any active motility is known as _____.

• A. spirochetes
• B. flagellated bacteria
• C. non-motile bacteria
• D. vibrio

Answer: (C)

Verified step by step guidance

1. Understand the concept of bacterial motility, which refers to the ability of bacteria to move actively, often using structures like flagella or axial filaments.
2. Recognize that spirochetes are a group of bacteria known for their unique corkscrew motility due to axial filaments.
3. Know that flagellated bacteria possess flagella, which are whip-like structures that enable active movement.
4. Identify that vibrio bacteria are comma-shaped and typically motile, often using a single polar flagellum.
5. Conclude that bacteria described as 'non-motile' lack structures for active movement and therefore rarely show any active motility.