Bacterium -

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

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

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

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

Engineered bacteria produce insulin, vaccines, and enzymes used in detergents. 4. Human Health and the Microbiome Bacteria play a critical role in maintaining the

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

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 microscopic

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