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Kingdom Eubacteria: Bacteria of the three major shapes: bacillus, coccus, and spirillum.

Gram-positive bacteria.

Gram-negative bacteria.

Bacteria "invented" the electric motor, illustrated by the base of the flagellum in which electrical charges cause the flagellum to spin.

Internal membranes are rare in bacteria and other Monerans (Prokaryotes), whereas they are the rule in Eukaryotes.

Examples and key characteristics of bacteria (1).

Examples and key characteristics of bacteria (2).

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