Bacterium Official

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.

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

Common forms include cocci (spherical), bacilli (rod-shaped), and spirilla (spiral).

Bacteria reproduce asexually through , a process where a single cell duplicates its DNA and splits into two identical daughter cells. Under optimal conditions, some species can double their population every 20 minutes. They can also exchange DNA through conjugation , which allows for the rapid spread of traits like antibiotic resistance. 3. Ecological and Industrial Importance The human body is home to trillions of

Scientists use a Gram stain to classify them. Gram-positive bacteria have a thick peptidoglycan layer that retains purple dye, while Gram-negative bacteria have a thinner layer and an outer membrane, appearing pink.

Bacteria are generally categorized by their shape and the composition of their cell walls: These are typically treated with antibiotics , though

They break down organic matter, recycling carbon and nutrients back into the ecosystem.