what size is e coli
Escherichia coli is a rod-shaped bacterium. Each bacterium measures approximately 0.5 Î¼m in width by 2 Î¼m in length. E. coli is a Gram-negative bacterium. E. coli cells stain Gram negative because they have a thin cell wall with only 1 to 2 layers of peptidoglycan. E. coli is a facultative anaerobe, which means it does not require oxygen, but grows better in the presence of oxygen.