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Bacteria come in three basic shapes. Some are round or shaped like a jellybean. Some are spiral-shaped like a corkscrew. Some are long, like rods.Each sphere or spiral or rod is called a cell. Animals have millions of cells, but bacteria have only one cell. This single bacterial cell is called a bacterium. An outer wall surrounds the cell and protects it. A substance called DNA floats around inside the cell.
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