Low G+C gram-positive bacteria

Definition

Low G+C Gram-positive bacteria are a group of bacteria characterized by having a low guanine (G) and cytosine (C) content in their DNA. They belong to the phylum Firmicutes and include many significant human pathogens.

5 Must Know Facts For Your Next Test

1. Low G+C Gram-positive bacteria typically have a G+C content below 50%.
2. They include genera such as Clostridium, Bacillus, Staphylococcus, and Streptococcus.
3. Many of these bacteria can form endospores, which makes them highly resistant to harsh environmental conditions.
4. Some members are important in medical microbiology due to their pathogenicity, such as Staphylococcus aureus.
5. They are commonly found in soil, water, and as part of the normal flora of humans and animals.

Review Questions

• What is the defining characteristic of low G+C Gram-positive bacteria?
• Name two genera that belong to the group of low G+C Gram-positive bacteria.
• Why are some low G+C Gram-positive bacteria significant in medical microbiology?

Related terms

Firmicutes: A phylum of bacteria that includes low G+C Gram-positive species.

Endospore: A resistant, dormant structure formed by some bacteria for survival in adverse conditions.

Pathogenicity: The ability of an organism to cause disease.