📖 what
What is a bacterium?
Quick Answer
A bacterium is a single-celled microorganism with no true nucleus. Bacteria are found almost everywhere on Earth and can be helpful, harmless, or harmful.
The Full Story
Bacteria are microscopic single-celled organisms classified as prokaryotes because they lack a membrane-bound nucleus. They are incredibly diverse in shape, metabolism, and habitat, from soil and oceans to the human body and deep-sea vents. Some bacteria are essential for nutrient cycling and digestion, while others cause disease. Bacteria were among the earliest forms of life on Earth and remain fundamental to ecosystems and biotechnology.
Key Facts
1.Single-celled prokaryotes
2.Found in almost every environment on Earth
3.Can be beneficial, harmless, or pathogenic
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"The tiny life form everywhere on Earth"
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