Bacteria
Bacteria are a domain of microscopic, usually single-celled prokaryotic organisms found in nearly all environments on Earth.
Bacteria are a domain of microscopic, usually single-celled prokaryotic organisms found in nearly all environments on Earth. They are structurally simple, lack a membrane-bound nucleus, and include species that are beneficial, harmless, or pathogenic to other organisms.
Characteristics
Bacteria are prokaryotic microorganisms with DNA not enclosed in a nucleus. They are typically small and may have spherical, rod-like, or spiral forms.
Habitat and diversity
Bacteria occur in almost every habitat on Earth, including extreme environments such as deep-sea and subsurface settings. Their metabolic diversity allows them to use a wide range of chemical sources for energy and growth.
Relationship with humans
Many bacteria live harmlessly on or in the human body, especially in the digestive tract and on the skin. A smaller number are pathogenic and can cause disease.
Scientific study and uses
The study of bacteria is called bacteriology, a branch of microbiology. Bacteria are used in food production, biotechnology, and other industrial applications.
Key facts
- Bacteria are microscopic single-celled organisms that lack a membrane-bound nucleus.
- They are found in soil, water, air, extreme environments, and inside the bodies of plants and animals.
- Bacteria show wide diversity in shape and metabolism.
- Some bacteria cause disease, but most are harmless or beneficial.
- Bacteria play important roles in ecosystems and industrial processes.
Bacteria are relevant to Canadian health, food production, environmental science, and biotechnology, and are studied in Canadian schools, universities, and public health systems.
Frequently asked questions
What are bacteria?
Do bacteria have a nucleus?
Are all bacteria harmful?
Where do bacteria live?
What shapes do bacteria have?
References
- Britannica — https://www.britannica.com/science/bacteriaSupports: Bacteria as microscopic single-celled prokaryotes, habitats, metabolic diversity, beneficial and pathogenic roles.
- The Canadian Encyclopedia — https://thecanadianencyclopedia.ca/en/article/bacteriaSupports: Definition, cell structure, sizes, shapes, and Canadian-relevant encyclopedic treatment.
- Wikipedia — https://en.wikipedia.org/wiki/BacteriaSupports: General overview of habitats, prokaryotic nature, and early appearance on Earth.
- National Human Genome Research Institute — https://www.genome.gov/genetics-glossary/BacteriaSupports: General characteristics, shapes, human microbiome relevance, and biotechnology importance.