Bacteria constitute the big domain of the prokaryotic microorganisms. The cell structure of these microorganisms is not as complex as other microorganisms. They lack the nucleus or membrane-bound organelles. They are also single-celled. Their genetic detail exists in their sole DNA chromosome. Bacteria can be classified into 5 groups according to their shapes: rod, spiral, comma, corkscrew, and spherical.

Sample 1

“Bacteria can be good or bad. Good bacteria can be helpful to humans, animals, and even plants.”

Sample  2

“Good bacteria can be our friends. The bad ones are our biggest enemies.”