Bacterium Apr 2026

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

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

Certain bacteria in soil convert atmospheric nitrogen into a form plants can use to grow. Common forms include cocci (spherical)

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

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.