Bacilli

Cocci

Spirilla

Vibrios

Spirochetes

Gram-positive bacteria contain large amounts of peptidoglycan, while gram-negative bacteria contain only trace amounts

Gram-negative bacteria contain large amounts of peptidoglycan, while gram-positive bacteria contain only trace amounts

Gram-positive bacteria belong exclusively to the domain archaea

Gram-negative bacteria belong exclusively to the domain archaea

Peptidoglycan is stained through a Gram stain, and Gram-negative bacteria are more virulent than Gram-positive bacteria

Peptidoglycan is stained through a Gram stains, and Gram-positive bacteria are more virulent than Gram-negative bacteria

Lipopolysaccharides are stained through a Gram stain, and Gram-negative bacteria are more virulent than Gram-positive bacteria

Lipopolysaccharides are stained through a Gram stain, and Gram-positive bacteria are more virulent than Gram-negative bacteria

Peptidoglycan is stained through a Gram stain, and Gram-positive and Gram-negative bacteria have comparable virulence

Chains of purple spheres

Clusters of pink spheres

Purple rod-shaped organisms

Pink comma-shaped organisms

Purple spiral-shaped organisms