Bacilli

Definition

Bacilli are rod-shaped bacteria that belong to the domain Bacteria. They are known for their ability to form spores and survive in harsh conditions.

5 Must Know Facts For Your Next Test

1. Bacilli can be found as single cells or in chains.
2. They are predominantly Gram-positive, meaning they have a thick peptidoglycan layer in their cell walls.
3. Some Bacilli species can produce endospores, which allow them to withstand extreme environments.
4. Important genera include Bacillus and Clostridium, both of which contain medically significant species.
5. Bacillus anthracis is the causative agent of anthrax, a serious infectious disease.

Review Questions

• What shape characterizes Bacilli bacteria?
• Why are Bacilli considered predominantly Gram-positive?
• Name two genera that include Bacilli and their significance.

Related terms

Coccus: Spherical-shaped bacteria often found in clusters or chains.

Endospore:

A tough, dormant structure formed by some bacteria for survival in adverse conditions.

Gram Stain:

A method of staining used to differentiate bacterial species into Gram-positive and Gram-negative.