Question

Amphitrichous bacteria contain flagella like this:

• A. Two flagella at each end
• B. Many flagella at each end
• C. Single flagella at each end
• D. Three flagella at three sides

Hint:

"Amphi-" means both sides — amphitrichous bacteria have a single flagellum at each end.

Answer 1

The Correct Option is C

In bacterial classification based on flagellar arrangement:
- Monotrichous: Single flagellum at one end.
- Lophotrichous: A tuft of flagella at one end.
- Amphitrichous: Single flagellum at both poles (one at each end).
- Peritrichous: Flagella all around the cell.
Hence, amphitrichous bacteria have one flagellum at each pole, enabling them to reverse direction quickly and swim efficiently.

Answer 2

Amphitrichous bacteria contain flagella like this:

Amphitrichous bacteria are characterized by having a single flagellum located at each end of the bacterial cell. This arrangement allows the bacteria to move efficiently in both directions.

The presence of flagella at both poles aids in motility, enabling the bacteria to respond quickly to environmental stimuli by changing the direction of movement.

This flagellar arrangement is distinct from other types such as:
- Monotrichous: single flagellum at one end,
- Lophotrichous: multiple flagella at one or both ends,
- Peritrichous: flagella distributed over the entire cell surface.

Therefore, amphitrichous bacteria have single flagella at each end.

Correct Answer: Single flagella at each end