Bacterium May 2026

Bacteria are generally categorized by their shape and the composition of their cell walls:

Bacteria play a critical role in maintaining the planet's balance: bacterium

Bacteria are microscopic, single-celled organisms that exist in virtually every environment on Earth, from deep-sea vents to the human digestive tract. They are , meaning they lack a nucleus and membrane-bound organelles. While often associated with disease, the vast majority of bacteria are either harmless or essential to life. 1. Structure and Classification Bacteria are generally categorized by their shape and

Certain bacteria in soil convert atmospheric nitrogen into a form plants can use to grow. bacterium

Many use flagella for movement or pili to adhere to surfaces or exchange genetic material. 2. Reproduction and Growth

The human body is home to trillions of bacteria, known as the . These "good" bacteria aid in digestion and protect against harmful pathogens. However, pathogenic bacteria cause diseases such as strep throat, tuberculosis, and urinary tract infections. These are typically treated with antibiotics , though the overuse of these drugs has led to the rise of "superbugs"—bacteria that are resistant to standard medical treatments.