Gammaproteobacteria

Definition

Gammaproteobacteria are a class of diverse, Gram-negative bacteria that include many well-known human pathogens. They are characterized by their metabolic diversity and ability to thrive in various environments.

5 Must Know Facts For Your Next Test

1. Gammaproteobacteria include notable genera such as Escherichia, Salmonella, and Pseudomonas.
2. Many Gammaproteobacteria are facultative anaerobes, meaning they can survive with or without oxygen.
3. They play significant roles in nitrogen fixation and other biogeochemical cycles.
4. Some members of Gammaproteobacteria are involved in symbiotic relationships with plants or animals.
5. This group includes both free-living species and those that form intracellular pathogens.

Review Questions

• What are some key genera included in the class Gammaproteobacteria?
• How do Gammaproteobacteria contribute to biogeochemical cycles?
• Explain the metabolic versatility of Gammaproteobacteria.

Related terms

Proteobacteria: A major phylum of Gram-negative bacteria that includes five classes: Alpha, Beta, Gamma, Delta, and Epsilon.

Escherichia coli: A species within the Gammaproteobacteria known for its role in human intestinal flora and as a common laboratory model organism.

Facultative Anaerobe: An organism that can switch between aerobic respiration and anaerobic methods depending on the availability of oxygen.